Rat...... My buddy has a 93, maybe 94, 95 18ft Donzi with an alpha and a sbc. He pulled the engine, did a mild rebuild with forged pistons, Edelbrock aluminum heads, a fairly mild hyd cam, and a 6-71 Dyer blower with twin 600 holleys.
Never had it on the dyno, but I would say it's probably makin atleast 450-475 hp.
After some hard running, when you kill the engine, if you splash water on the top of the drive, it'll sizzle off !!!
He's blistered the paint off the top of the drive. And he even made a custom drive shower for it too.
He's easy on the throttle from a start, but does alot of WOT running, but always slows down to let the drive cool down.
He's yet to break that drive, although the boat never airs the water, as he only runs it on very calm inland lakes. After about 70 mph, this boat chime walks so bad that I kicked his foot off the throttle pedal to get him to slow down. It's the scariest boat that I've ever been in, and I've driven a few 160 mph V-drives.