Vibration issues

Hold it !! DO NOT go off into la la land. Do not make a problem where there is not one. You say you have a new drive shaft built buy "a shop". Lets start at the beginning and NOT make a new problem. The vibration is from your new drive shaft. That's it. Is that your original yoke? The 360 motor, the 727 trans,the 741 case, and the 7260 u joints are all what was there BEFORE YOU GOT THE VIBRATION.
None of that stuff matters. Is this shop a drive shaft specialty shop?
NOW HERE GOES>>>>>THEY DID NOT BALANCE THE NEW DRIVE SHAFT!!!!!!!!