273, or 318?

junkyardhero said
straight from summit:
performer RPM air gap: SBC- $345 SBM- $460
thumpr cam kit: SBC- $500 SBM- $620

and note, that price differential is just for run of the mill stuff. mopars are just more expensive across the board

Yes. Now the basic pistons, rings, bearings and gaskets should be reasonable, however a bit more expensive. The aftermarket kills the Mopar fans, volume rules there.