Probably so, I had a set of performer RPM's on a 358 sbc I bracket raced years ago, max rpm I got was around 6800, but that could of been due to my hydralic cam.
I'm sure with a solid roller and a spring change you could get more out of them.
If your dead set on upgrading though - get some dart 220cc iron eagles platinum heads, they are great out of the box, with some port work, even better.
Goodluck, Cp