I just ran the program again with a 30 over 440 and stock Stealth heads. In order to make 475 HP you need a roller cam, single plane manifold, 10.5:1 comp and 1000 CFM carb. The problem is, it doesn't make that hp until 5000 RPM. It makes 500 ft/lbs of torque between 4000 and 5000 rpm

The trouble with this setup is that the sucker will have a terrible idle because of the cam.