Since this is something that is nowadays common to be discussed (FINALLY!....

)...... here are documented/depicted cases (with chevy/holden cases though) that I found and wanted to share. Look at the different cam base circle and lift specifications + the different cases shown with different style/brands of SR lifters.
The one shown below, is a solid flat tappet lifter.
The originator of the above depictions (credit were is due) is at
http://users.telenet.be/jov/opeltuners/rollerlifters/rollerlifters_search.html