There is a lot more info, that you need to supply. 500-550 HP is not a problem but at what RPM range? 3000,3500 or 5,000-5500. What heads and intake manifold are you going to run? You don't need the roller cam if your goal is just 525 HP. How long do you need to run it at max RPM's in your jet boat? And 9.75:-11:1 compression is not a problem depending on the heads you choose?
What do you think your cruising rpm's should be and where do you want your Max rpm's to be?
Depending on the cam and heads/intake combo you'll be able to rev that to 6,500 if that's what you want to do.But at those rpm's you'll be way beyond your 550 hp goal. Are you looking at build a HP engine above 5,200 rpm's or a Torque monster below 5,200 rpms'?
I made 710 HP at 6,200 rpm's out of a 512 Ford w/ an off set ground cast crank, 10.25:1 comp. with a 2 bolt block w/stud kit. We ran a 250 HP Nos system on top of that with no problems for 2 years.
Sleeper CP