500hp 408 with Hi-Po 340 Manifolds?

To build a high horsepower FAST motor, you need to focus on making torque and maintaining it as high of an rpm as possible. Which sucks for a tire limited car.
Doesn't matter who does the heads, they all flow about the same, same goes for the intake and carb and exhaust manifolds. The only way to make more power is to focus on the bottom end and make as much toque as possible, then using the cam to keep it up as high as possible. If I were to put a set of slicks, headers, intake, and a cam to work with headers my duster would run in the 9's.

Jeff P built a guy a FAST legal pump gas stroker smallblock, somewhere around 430+cu in, solid cam, etc. Made around 475hp, and Jeff knows his chit. The only thing we can do to make more power is to up compression, and more aggressive cam. The heads flow what they flow, there is no magic.