I have located a nice little bowrider with a frozen 4.3 . If I can drive a good deal on the boat and have to put a motor in it I would prefer a bit more HP. so If I could reuse the pulleys and the dressing on a 350 and switch the exhaust over will it work? On the other hand I have a 502 that needs dressing and am wondering about interchangeabiltity.

The manifolds will be smaller for the small block to the big block,the mounts will have to be moved and a few other things.

as the 4.3 is basiclly a 350 with 2 cyl's gone the front should be close and work fine...Rob

Thats what I was thinking from 4.3 to small block. How about small block to the big block?

nothing bracket wise is going to work without mods....not sure how much....be better off finding all big block parts there I think...Rob

What size of boat is this? is a big block going to fit? will the hull stand up to a big block? Weight, speed,ect?

wouldn't that have an alpha drive? if so I'd think you'd need at least a stock bravo drive.

your right, if he goes big block he will need a bravo drive sys.

The pulleys will fit the 5.7 from the 4.3....but they WONT fit on the BBC...totaly different.
The motor mounts will all fit as they are all in the same spot....its gonna be a matter of wether or not you have the room to actually fit the BBC in the engine compartment...