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Sharky - Here in the Great Lakes region, there are two operations that re-manufacture Mercury in-lines. And you are correct, an owner of one of these engines needs to find shops that still have the knowledge to work on them. Parts seem to be readily available.

This is who I used for the engine on my Montauk. Total cost was about $5500. He used to be located in Suburban Chicago, but has relocated to northern WI. As you can see, he does beautiful work. See his link for completed engines:

http://classicmercuryoutboards.com/homes.com/home

This fellow, I believe is an ex-Merc employee, and a re-manufactured in-line 6 runs about $5000-$5500 I believe. He is located outside of Milwaukee

http://mercrestor.com/

Also, around this part of the country, where summers are cold and short, and the water is fresh, there are still good condition used in-line 6's to be found, not needing too much work. You may have to buy a junk boat along with it, to be resold cheap, to get it, however. There seems to be lot of them in Wisconsin.

Since you like these engines, you may want to see my other boat, sporting two of them!
I bought them new, and have kept them in like new condition ever since.

http://photobucket.com/gallery/user/l...TE=/?ref=1

http://photobucket.com/gallery/user/l...Gc=/?ref=1

For that 13 you have, a four cylinder Merc 50 would be nice. I used to have 1958 Hull #11, and I had a 1970 version of that engine on it. Here is a photo.