And just out of curiosity... I was watching a video of this guy with a like a 3 Liter I-6 2JZ engine in his 96 or so Toyota supra. He made like 650hp at ~19psi and 950hp and ~40psi. He had forged pistons and rods and everything. Why couldn't you make that kind of horsepower with another liter of disp. and the same types of mods?
69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.