For a 440 and 360 to make the exact same HP the 360 will have to rev higher (I suppose you could come up with a really crappy built 440 that had to rev to the moon to muster up 500 HP) but in reality a reasonbly well built 440 will not have to rev as high as a 360 to make the same HP. HP ir pretty relative to the air and fuel burned in an engine and a 440 will suck in enough air for 500 hp at a lower RPM than the 360 can. With out some for of artificial power adder the 360 needs to suck in the same air as a 440 for them both to arrive at 500 hp, no way around that and the only way it can suck the same volume of air is fill it more times in the same time span.