Thanks for the replies guys. Our boat currently has a stock 350 Magnum. I've tried many props and found it to run the best with a 23 Lazer II @4900 rpm. Most of the time it's just me or one other person on board.
A buddy has a 170 hr 1997 454 Mag available for a good deal
Waterfoul, last spring I took the Alpha SS drive off and put a std 1.50 Alpha in it's place. They must have a pretty high stock X dimention because it runs faster with the longer drive.
Pachangalpina, how did it handle at 80+???