69 Barracuda Clutch Shake Help Needed.

Lets go back to the clutch.

You had an issue with the install that may seem minor, but could have really effected the hat and disc when it made contact with the bell housing. Think about that and how it may have upset the springs on the clutch facing. Did one break? There may be more info you have not shared that may help one of us lead you to the real issue you search to find.