Pay attention. I gave OPTIONS. A chink head is one. An Edelbrock is another. Either one of those junk heads will make 500 HP rather easily and you can use a Stock intake and headers.
If you really want to do it easy get a set of W2 heads. This isn’t hard, why are you trying to make it hard, and play yourself the engine builder?
500 horsepower was meh 20 years ago with the heads we had then. For a 23 degree chevy head. It was stupid easy.
You don’t need anything exotic to do 500 HP.
Really, some of you need to figure it out. This **** ain’t hard.