Yeah there were all these arguments on the forums years ago so I went and bought one rocker from each mfg and put them all on a shaft. Once I did that I said "okay, now I get it"!

The Mopar rocker arms are all over the map. You don't know what works until you try it. Eventually I created a little cheat sheet that told me which rocker arms worked with which cylinder heads. If a person just randomly selects a rocker arm package then good luck and may the force be with you. Not everything works on everything.