500ci street ride, what head to use?

Cheaply done, Edelbrocks home ported/touched up and back cut valves.
Money well spent, Preped and touched up Indy's EZ. (?)
Money,......well........spent, ported iron.

Sell the iron and roll it over into the new head. Seriously speaking, if your not going to step up a bit on 500 cubes, you were better off building a 440. Otherwise, the 500 will perform like a 440 if you leave it choked via the head.