could have done the same thing to a 6.4 with drop in forged pistons and made more power. I was reading about one the other day that made 580 HP on an engine dyno without pulling the valve covers, just a wilson modded tall mopar intake intake and blackjack long tube headers and a carb. Heck I bet 30PSI would be way over 1000 hp at the rear wheels with an efficient drivetrain.