We extend to you a cordial "WELCOME ABOARD !" Come on in, make yourself at home, we are a friendly group of enthusiasts, and we also appreciate the classic Chris Craft Roamer, Corsair, and Lancer boats too , as they are all on the same family tree and share much in common ! Just start by posting a note introducing yourself to the group, that's all it takes here (we don't ask for or retain any personal information here, because our intention is to just "have fun and share information".
Is it possible that this could have been some sort of factory conversion? In the classic car world I've heard of many odd things being modified for one reason or another. I recall a story about a mid sixties Corvette. The guy restoring it found "p" on the vin tag where the paint code was. There was no "p" paint code. After a lot of research he discovered that the car was special ordered through the GM COPO system(Central Office Production Order) unpainted. The "P" was for Primer.
Seeing that this boat has the Italian connection I think anything is possible. Not likely, but possible. I guess the point I'm trying to make is before you go doing a ton of modifications to what you think is correct, do a bit of research first. You could destroy a one off creation.
I can just imagine two engineers pontificating about using a trans-drive on an XK instead of the V-drive and one saying, "lets take one off the line and try it out".