Ok for the sake of this discussion, let me revise my parameters. Let's discuss the best offset regardless of brand to improve the RPM head.
The goal is a steetable head that could go on a ~400cid engine and make 500lbft/500hp
I have stock stamped rockers for BB and SB and a set of SB speedmaster stainless on the shelf. So essentially no, I have not purchased a set for this build.
Referring to low lift flow I assume? Off topic, but If you had to prioritize either offsetting the pushrod or a bigger valve which would you go after?