Could you explain that??
Comp, just trying to keep it simple for everybody here...and suggesting the bolt-on replacement rockers rather than those that may require more attention to set-up.
I'm actually not totally sure (with hard numbers and all), but Harland Sharps seem to differ in their configuration over the other makes I mentioned. It's as though the roller rip-to-trunion is a longer dimension, or something...some people have trouble setting up their valve train geometry with them; the roller tip is too far outboard on the valve stem tip, and altering pushrod length in order to bring the roller tip into place causes other clearance issues and/or geometry is then incorrect in another way.
But since you inquired, all of this can be alleviated by getting longer rocker studs (I know you just figured out the rest).
Just trying to keep rocker choices simple for those here that ask; this isn't an engine build forum...
LO