Insurance and helps the flex and vibration
chevy rockers are longer fulcrum to roller
mopar rockers are short
longer is better
you can get higher ratios when you backset
what about the crower's with the back-set fulcrum
it is more important to have the geometry right than the roller centered
that said it cannot go too near the edge
higher lift cam you have to lower the fulcrum compared to stock (which helps move the contact point toward the intake side) (or use a lash cap if you can't lower the fulcrum
grinding pushrod clearance is a fact of life with MOPARS