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head wise, how can a stock type head make that kind (450-500) of power? 915 & 906 Mopar heads just do flow what a good stock small valved small block chevy head flows. I can see where the monstrous torque comes from but how can they feed a 6,000-6,500 rpm 500-550 HP 440?



Nobody here's making 500hp with stock UNPORTED heads. Take a set of stock heads, and invest the money into going with larger valves and some good quality port work and you will make them flow just as good as the eddy RPM/440source heads. You can make 500hp with those heads, because they flow decent OOTB.

Look at 383man, he's got a similar car to yours, and his 440 with ported, big valve 906's is running 11.5's in the 1/4.