You can start with replacing the U-Joints, simply because that is a cheap fix. On the other hand I can almost Guarantee I know what the problem is...The EXACT same problem happened to me with my '69. It's the drive shaft. If it's been banged up or dinged, more than likely it's out of balance. Mine was so bad after review, I just bought a new one. Stainless and shiny, but cost me $250 (locally).
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