It can be done on a SBF easily, a SBC is a different case. The lifter bores in the hyd. roller engines is .200" taller, plus it has a flat between the bores so the wishbone will lay. In the 80's we use to adapt early blocks by using lifter bore sleeves, but this takes expensive tooling and labor. The other thing about OEM lifters is they are limited to .618" lift due to the body design.