Well, the head in my pic is a BBM 210cc head, I’ve done 1/2 dozen or so sets of those, I’ve done two sets of the BBM 265cc/325cc “Victor copy” heads......only one set of the SBM heads...... probably a dozen or so sets of BBC heads(I’m referring to Pro Comp/SM heads).
For the “budget” SBC guys I use a head that comes from a different supplier.
I’ve had about a dozen or so sets of those through the shop as well.
The aftermarket head I’ve had in the shop most often are actually the Ede RPM/E Street BBM heads.
I’ve done well over a hundred sets of those through the years.
I typically get more BB work than SB, but I’ve probably done around 40 sets of Ede RPM SBM heads as well.