1967 Dart Drivetrain swap.

If you use an 8.8, you will have to buy another short axle and then have someone shorten the long side tube to match the short side tube. "Easier" for me as me as I have done it lots of times and have the jig to do it. I have seen guys do an 8.8, and most have been a cluster f^&k. They just cut the longer tube and butt weld them together. Have also seen the opposite, that has been done very nicely. Up to you and your pocket book.