My heads really work well with just a bowl blend and gasket match. I also just clean up any sharp edges and casting flash. Heads are milled in NHRA min chamber size and are cc'd and equalized. I run stainless exhaust valves, 340 valve springs and Fel-Pro Viton positive intake valve seals (no machining required). Back cut intake valves. No one would believe how my 273 runs. All with an Isky E-4 cam. For more than that,
@perfacar,
@318willrun and
@GTX JOHN know a whole lot more about porting.