Just for reference, here is a picture that shows the parts used. PSI 1246 springs and the Manley retainers and locks.

Manley retainers 23640-16 will work with Manley 221424-16 springs and the Manley 13198 locks to provide a 2.00 installed height setup that is good for 0.850 lift roller cams. Manley says the 424 spring is good for .880 lift but that seems to be pushing it. The Jesel rocker arm geometry is good up to a little over .900 lift and then it starts to run off the side of the valve. I'm not sure what rocker arms a guy would use if they wanted to run more lift that that. Guess that is a different problem to solve some day.