I built two almost identical 511" HEMIs at the same time for two different guys. They both had BOX STOCK Stage V engineering standard port location heads and they were both pump gassers. One was FAST Fuel injected and the other was a two four barrel carb deal. Both used the stage V dual quad manifold as well and they both made basically the same power on the dyno at around 720. They both had very mild camshafts with around 248 @ .050 duration and .650 or so lift.