Some other things to check that come to mind. Is the car using all of the components, other than clutch assy, that it came with from Ma Mopar? Or is it a mix and match? Did someone swap in an a-body A engine trans in and not know that the B engine trans use the larger from bearing retainer which is bb/hemi only? Giving you hotdog in the hallway since the A trans uses the smaller retainer therefore trans to bell housing alignment is not happening.