69 Barracuda Clutch Shake Help Needed.

My plan this weekend is to revisit all the easy stuff. For example the rear brakes. Take them totally out of the picture and see if the car still shakes at take off. Having no shake at all with the old school bars on would seem to be a clue toward the rear of the car somewhere. Only things I haven't addressed are the carrier itself and the brakes by total removal, adjusting so far inboard they won't contact the drums in the rear or just pushing all the fluid out of the master cylinder and wheel cylinders.