500hp with the factory parts and manifolds is not going to be anything you are going to be driving on the street... My old motor made less than 500hp on the dyno, and the new one isn't much above it.
Forced induction make it possible to have a streetable combination because the cam specs for turbos and blowers don't like or need much duration or overlap. This results in a lot of low-end torque and a smooth idle.
The big problem is, building an engine that is happy on 93 octane when running boost. My own 360 Magnum made 445 rwhp (about 525 at the flywheel) with 10 pounds of boost from a Vortech centrifugal, belt-driven supercharger, and is happy with pump gas if I use a MSD Boostmaster ignition timing retard.
Idles at 475 rpm, smoothly, with 12 inches of vacuum...
