Personally, I think any boat with a big V-8 is cool. Nothing sounds better then a big block rumbling in the marina. If you are looking for the ease of finding parts, Chevy is the way to go. I have just purchased the following for a reasonable price for my bone stock BB Chevy(454).
Comp Cams Extreme Marine K11-240-4, Weiand Team G Intake (1500-7000 rpm), Summit Roller Rockers, Performance Distributors HEI Ignition, Holley Marine 750 Carb, PJ Gear Drive. The heads will get a mild port and polish and hoping to get a set of Lightening Water Jacketed Headers (blems). All of this for around $2500.00 and approx 475-500 hp. These projects have a way of growing on thier own. Good luck to you and your project...Joe