Compression is one "key" to big horse power, but a streetability cost.
My 427 FE was 667 horse, with 12.5 to 1 c.r., a radical solid roller cam, high riser (HUGE) heads and matching twin four barrel alloy intake and open headers at 6000 rpm. 660 cfm full drag race Holley carbs.
On the track I would shift at 6000 or 6500 but there was essentially no difference in the time slip. At 6500 I'd finish in 3rd, at 6000 in 4th gear.
It was "to much". I have the engine out reducing compression, milder cam, smaller carbs, more streetability. I'm pretty sure 500 horse will still be "enough".
Oh,,,, .017 bore with 428 crank and 72 cc heads.