I've done both small block and big block. The Quench area in the stock heads can be different depths on the same head. We used a 3" green 36 grit disc to get them all close. Finished them off with a 2" scotch brite pad. The small block worked very well. Over 12-1 on pump gas with a roller (255@.050? I forget). The RB didn't seem to help as much. Only 9.7-1 with a224@.050 Hyd cam,3.23 gear it will rattle ocasionally on 93 octane at 36 degrees total.
Doug