BH = Bell-Housing
I know that once 230/250/292 series were introduced, Chevy standardized so the I6's, SBC & BBC's all had the same bolt pattern. I think this went all the way up to at least 1996.
I'm thinking if I get the '62 235 it'll required some effort to get it into my '53 Bel-Air 3spd. I presume I'll need the car BH, some modified side mounts, and do something about the water-pump & fan.