I assumed there is a chance he had the double humps already. I was thinking the Vortec and World Product or even the Racing Head Service heads (cast iron) would flow about the same.
It's all about the benjamin's at that point. Double Hump, RHS/World Products, Vortec, then full on aftermarket like AFR, TFS, Brodix, etc.
The roller cam is a nice touch too, but be prepared to spend around 600 coins for the cam, retrofit kit and installation at a shop.
If you prefer a standard flat tappet hydraulic cam, you can buy the ZDDP additive for the break-in from a cam shop like Competition Cams. Add to oil, run break-in as usual.
The Roller cam would give you *noticeable* gains in torque and HP over a flat tappet though, so you do get something for your money. Don't choke off that potential power with old heads though!
I gotta go re-apply my hair wax.