Re: Please tell me this is a nutty idea so I will stop looking at this boat.
A head gasket change is something that should/might be doable without pulling the engine. But the issue, I suppose, is - is that ALL that's wrong? Who determined that was the problem? How reliable is that nugget of information.
The ability to DIY this is a big factor, as xymotic indicated.. cost wise and comfort level wise. Paying someone $80-100/hr will up the ante in a hurry.
A cherry boat with just this issue could be a good deal overall.. but but but.....
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)