You have almost everything to make 1000hp. That number isn;t as easy to make as most guys think. 1000REAL hp, not inflated advertising numbers, but in the real world. The cam for sure is to small, it won;t make that powewr with that cam. I use 270 at .050 cams on some pump gas 509's. Its a BIG engine, and it needs a BIG cam. Something like 286-298 at .050 with as much lift as you dare. But for sure you need something in the .800+ range. The heads will make that power easily.
I have made 1129hp and 985 ft/lbs on a 598 injected on alky with a ported Dart tunnel ram with those heads. 1000hp is not a big deal, just lighht on the cam
Frank
Advanced Performance
www.get-ap.com