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Does the engine water intake need to be primed?  When adding antifreeze last fall the engine didn't want to suck in the antifreeze I was pouring in the top of the intake strainer. Posted about it here and someone mentioned the impeller might have broken.
At the boat today. Looked at the impeller, intact. Pulled the intake strainer. Clear. Hose from thru hull to strainer is clean.  Hose from strainer to water pump is clear. Hose from water pump to heat x clear.  Put everything back together. Tutned engibe on. No water coming out of the back of the boat. Pulled water pump apart. Had my daughter start the engine water pump is Turning so that is working. 
Seems like water isn't getting pulled into engine.
Took the hose from the water pump to the heat x off, at the heat x and  turned engine on. Wanted to see if I was getting water up to that point. Figured m aybe issue was after that point. No water came out after running for a minute or two.

Please post pictures as you go along.  I'd be interested in your installation.

I have a used main sail cover from my MK-I.  About 4-5 years old.  In good condition.  It's blue.  About 1 shade lighter than the dark Sunbrella Navy blue. 

When I used to store my boat on the hard, I always left the mast up.  Never had any problems in the 4-5 years I did it.

Marina I'm in now lets us keep the boats in year round.  I'm in New England.  Never any issues keeping it in the water during the winter either.

Found the fins when I overheated in July. Couple in the housing and 1-2 at the heat x intake.  Since then the engine has been running like a champ, 160* all the time.  Was just when I was winterizing I noticed the problem again.  Will go down next weekend and check the impeller.

I'll check the impeller.  After the overheating in July, replaced the impeller, old one had lost some fins in the overheating.  Engine had been running fine for the last 2 months so figured the new impeller was still okay.

Was putting the boat away for the winter this weekend.  Raw water seacock was shut.  Pulled the raw water strainer out, started the engine.  Typically I run right back and start pouring a gallon of antifreeze in.  Usually takes only a minute or 2 then I shut off the engine.   This time I run back to the strainer and the water hasn't gone down.  Wait a minute and it starts to slowly go down.  Add a bit of antifreeze and wait.  Nothing happening so increase the rpm to 1800 or so.  Go back to the strainer.  It would slowly go down, stop then rapidly drop, I'd fill it back up and wait.  Kept doing this over and over.  I think it was about 15 min before it took the whole gallon.  Temp was about 185ish when I turned it off.

Earlier in the season I overheated the engine.  Since then it has been running fine, staying about 160-170 when underway.  Not sure what was going on with it yesterday.

Inlet hose into the muffler. It's a black rigid hose. Definitely not the blue hump hose.

Like I had mentioned, I had unscrewed the clamp on the inlet hose where it attached to the muffler. I was trying to get it off the muffler stub to see if the overheating had cracked or deformed the fiberglass stub. It was sitting about an inch up on the stub. As I lifted the hose up to try to get it off the stub, the riser moved up about an inch which I wasn't sure it should be doing.

I'm going to do what Noah said and look over everything. Do I have to be in gear or can I leave the boat in neutral.

It's clear water. A little dirty but clean. No anti freeze in it.  When I noticed the hose to the muffler was leaking and I loosened the clamp. I was able to raise up the hose and The exhaust pipe it was attached to would hinge up an inch or so. Didn't think anything of it but looking at Stu's exhaust replacement article I'm wondering if that exhaust section is supposed to be rigid with no movement.

Might have spoken too soon.  Went out for a sail Sunday. Motored about 20 min. Temp steady at 160. On thr return trip, also 20 min motor.  Was running at 160 then creeped up to 180.  When got close to the marina throttled down and temp dropped to 160.
I did notice thr was a bit of water in the bilge so something is still leaking. Will have to explore more next weekend.

Finally got down to the boat today.  Took off the hose from the pump to the heat x.  There were impeller parts stuck in the hose.  Cleaned that out.  Then took the pump off again and found another impeller fin in the discharge fitting.  Got everything back together then cleaned the bilge which was full of dirty water.   Started the engine, water discharging out.  Wanted it to warm up to see where the temp would land. 
Went back in the cabin and noticed the bilge was filling with water.  Figured one of the hoses had cracked.  Engine hoses seemed fine so looked at the muffler.  The hose from the engine that attached to the muffler was leaking pretty bad.  Was thinking Ron was correct.  Unscrewed the hose.  Felt the fiberglass and it felt solid.  Looked like the hose had loosened and risen up.  Pushed it back down tight to the muffler and tightened the clamp. 
Started the engine back up and no leaks. After 10-15 min the engine had kept steady at 160* so things appear back to normal.

Thanks for everyone's help.

Will go down tomorrow after work and play around with it.  Will go through the water flow and see if I can figure out what the issue is.  Other than the lack of water coming out, it seemed to be running fine back to port.

I usually close all the seacocks when we go home for the weekend.  Just on the odd chance a hose breaks during the week.  That's why I keep the key on the intake valve.  So I don't forget to open it when I grab the key.  For some reason I had left the valve open last weekend but put the key on it.  Wasn't even thinking and grabbed the key and twisted the value, unfortunately into the closed position.  First time in 11 years. 

Thanks, found them just inside the housing so was able to get them easily. Was able to make it back to thr dock.  Was running at 175*. Little water coming out the back but not getting the big blast of water like normal.  Do I need to add water to thr muffler?

Thanks. Just checked. Couple of teeth broken so replaced.

Keep the engine key on the engine water intake  alive to remember to open it before starting engine.  Had left the valve open but put the key on it. Came down today, removed key and shut the valve not thinking.  Just got out of the harbor and hear noises crime the engine and smoke. Shut it down. Temp gauge was pegged at 250. Lots of steam coming out of the manifold cap.  Didn't see leaks anywhere else.  Anchored now. Engine back down to 140. Manifold very low so filled with water for now.  Assuming I can get back to the dock, about 10 min motor.  What should I look for when I'm back at the dock?