i do all my own work, and have a good friend that runs an engine/machine shop.$8600-blowers, $4000-fresh long blocks, $3200-carbs, $15800-total leaving $4200 for cams and misc if i go that route

Weld crane put 10:71's on his 500s last winter. No cam swap. Runs awesome. Pro chargers make great power but the torque is a bit peaky and higher up in the rpm range from what I have seen. With the big Ssm style props you will be running, planing may be an issue with pro chargers because they won't make enough torque to get the big wheels it needs for the top end swinging. Mild thunders buddy was going through this recently.

Exactly what i was told by the rep. Bolt them on and go. Wouldn't know what he ran for carbs would you?

I can call him tomorrow, pretty sure they are quick fuel 850s

The 525EFI cams will work fine a blower setup and much better than the stock HP500 carb cams.
The cam change and TBS 250's @ 5#'s of boost should put you in the 650hp range. You could run a single Dominator carb as well.

[QUOTE=lil red;3844942 Pro chargers make great power but the torque is a bit peaky and higher up in the rpm range from what I have seen. With the big Ssm style props you will be running, planing may be an issue with pro chargers because they won't make enough torque to get the big wheels it needs for the top end swinging. Mild thunders buddy was going through this recently.[/QUOTE]

I dont know if they have gotten better in recent years, but Prochargers used to be a PIA to install too. Def not for a beginner. Lots of modifying as far as brackets and moving things around....then once running, they were not easy to tune......but, done properly, they DO make power, no denying that.

I like the whipple better than Root (TBS). The efficiency is 25-20% better. You get an intercooler and fuel pump with their kit and it is only 2" taller than you current engine which should easily fit under your curretn hatch saving you at least 2k in glass and upolstery work for scoops. just my $.02

I've kicked around all of these ideas with prior boats. You're better off with the Whipple's. You could run those till it's time to rebuild then if you want to change the heads or cams, do it at that point instead of wasting the money now. You shouldn't have to change the cams and the compression is fine. You'll probably be able to clear your hatch as well. If you install 10-71's and intercoolers, you're going to be installing hatch inserts, and maybe scoops. Figure that into your budget. The only thing I'd be concerned with bolting those on are the condition of your head gaskets.

All good points.whipple makes good products but they're pretty proud of them.as far as the hatch that's minor.what im kicking around at the moment is putting the 525 cams in before i put the motors back in since im done with the other projects and run them like that for the season.then next fall refresh and bolt the blowers on.I've done a few searches but theres a discrepancy in the crane part number.

Keep an eye out on in the swap shop. You can pick up whipple kits for e decent price there.