I am trying to wrap my head (pun intended) around this. Are you guys suggesting someone purchasing the Speedmaster Top End Engine Combo Kit (pictured) would need to modify the geometry to get them to work?
They will work and the car will run, but the implication is that the geometry is never right with aftermarket head and roller rockers so a tune up is needed to get the most out of the system. For a mildish daily driver it probably wouldn't matter but the hotter the setup and higher RPMs, supposedly optimized geometry begets better results.