Are you sure that your finger height was adjusted correctly when you installed the Zoom? Remove the inspection cover ,if used, and look at the 3 fingers that the bearing pushes in. There should be a small gap between the pressure plate cover and the fingers. If not, you have to reach in there with a wrench and adjust the adjustment nuts to create one.
I always look for the centrifugal assist pressure plates. My last McCleod had three rollers. I just found a new, unused 6-roller, that I installed in a friends 440-6, Challenger. It wasn't marked with a brand but was used as a stock pressure plate behind 440-6 and Hemi engines. You can hear the rollers rattle when you pick it up and shake it.
Before you install the new clutch, check the old one first.
Rob
