Personally, I'd go with the inline six again and an updated outdrive like Rich's set up. That way you wouldnt have to make a bunch of mods, cutting the boat up and it would be more original. Not that I am stricky about "original" but there are not many like yours around. Besides, since Rich has done it, he knows what needs to be done and would be a great advisor. It would be cool with a v8 though! Just my opinion.