69 Barracuda Clutch Shake Help Needed.

AJ/FormS said
IMO,only two sources could be your issue; the clutch or a dancing pinion angle.
A pinion angle by itself and not dancing,has to be pretty lousy to be noticed on take-off. All other sources of vibration would be continuous. The only source for a changing pinion angle is the rear springs.I would get someone to eyeball them while you do the E-brake test .
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I will do that E Brake test as you suggested. My plan was to pinpoint the angle issue and if it is there to just replace the springs. I may try wedges at the perches just as a trial for an ease out take off. I suspect that the bad springs is a root cause of the bad pinion angle.