All I can say is use the proper parts and let the horse power numbers fall where they may!!
Like has been said before ,many guys have beaten cars with more"quoted" hp than there engine really had,unless I see dyno numbers its just a guess.
The last 20 to 60 hp is found by tuning on the dyno and rarely just happens from assembled parts,most do not dyno tune the motor leaving the 510 hp at about 450-480 real untuned hp.Tuned meaning set for max hp,not idleing smooth and runs well.