[mattfranklin]

Google Hot Rod Engine Masters or Richard Holdener. They have done dyno tests so you can see what you're getting.

If you have a Vortec block, do you also have Vortec heads? Those are capable of higher hp right out of the box, or almost out of the box. You need to shorten the tops of the valve guides with a cheap tool to accommodate a cam with a lift higher that .450 (if I remember right).

Of course with a 3.07 rear gear you might not be able to put a hotter motor into its sweet stop soon enough.

Lots to think about. I went "stock" with mine and let the Chevy Corvette engineers of 1970 tell me what was hot and reliable and coverable by warranty. ;-)