490HP/512FtLbs. Don't forget, boys. Cam lift does not allow for 300cfm intake flow and he's runing a dual plane on symetrical port heads. He does have beter than 75% flow on the exhaust side (relative to the intake side) He's got a good amount of static compression, but he is also running dished pistons. Oh, and the distributor is on the wrong end of the engine.
My guesses are always on the conservative side.