Extreme clutch shudder

FWIW.......
Backwards is possible if you're not attentive. An MP disc centered and sitting on bolts does leave a small gap here. (.030" faced off this FW)
Wrong.....
View attachment 1715599663

Correct......
View attachment 1715599664


OP, after the install, when you first cranked this vehicle up and pushed in the clutch, did you possibly find you had too much pedal and drove the back side of the clutch cover fingers into the disc springs?
Do you have the crank bolts in place, Dave ?