I had to use the yoke from the T-Bird and a conversion U-Joint. That will do for now. When I upgrade to the 5.0 I will use the shaft from the donor vehicle and have it cut down or lengthened to meet the diff.
There are halfshafts that go in, I was pulling the rear diff to have it rebuilt when the photo was taken. It was worn out and howled all the time. Gears were shot, so I had it rebuilt with 3.31 gears.