Somewhere before 1972, there were some strange things going on with the rear-ends on these cars, and the transmission had the 'monkey-motion' linkage. Also, there was a large, rubber strap going over the front nose of the differential, just in case the nose wanted to rear it's head on hard acceleration. Of course, the differential mount on all the cars had rubber in it to quiet down the noise transmitted through the car, and the rubber gets rotten and comes apart. Also, the early cars had the differential mounted more forward than the later cars. This causes the half shafts to move in strange directions, all at the same time. Most gearheads choose to get the later differential move it back with the necessary pieces and line up the halfshafts just like the factory did. And a later 4 or 5 speed transmission for their cars, along with the needed, longer drive shaf. This sounds like a lot, but actually, it is all bolt-in from a donor car. good luck and keep us posted.