B series heads?

As everyone has said big block heads are big block heads they all fit every motor except hemi which are hemi specific of course.........
FWIW, and few will remember, the outlier one had to be aware of. That's the '68-'69 RR 383 with the + deck. I couldn't put 915s with steel shim gaskets on my '68 way back so I had a valve job done on the 906s.