I got very close to the 600 HP mark with my engine that had Stealth heads. 69' 440 block + .030", MP .590 solid lift cam, Ohio Crankshaft H-beam rods (standard length), Ross Domed pistons, stock stroke, stock forged crankshaft, Team-G intake and a 1050 dominator. The car is a '72 Barracuda, SS leaf springs w/ MP "50/50" long shocks, 11.5 X 29.5 tires, 6 cyl torsion bars up front w/ Calvert shocks, 4:56 Dana, 727 trans w/ a Turbo Action manual valve body and a Turbo Action #17509J converter. Weight was 3100 lbs. I was able to get this car consistantly to go 10.5x's/6.4x's.
The heads had very little port work done to them, mostly in the bowl area to clear the piston dome, then blended. I wound up with approx 585 hp and more torque than you would ever need.
The one thing that I will strongly suguest is for you to plan on installing a main stud girdle at the VERY LEAST. I broke a main cap during the first season. Billet main caps would be even better.
If I forgot anything, just ask.

Brian Dunnigan