8 3/4 rear end swap

You can shorten a driveshaft yourself. No need for balancing we have done this lots of times. The rubber line for dist. block is in a different location but you can move this if you run a new hardline over and a new bracket. Not all 83/4 were small bolt pattern the later years were 4.5 I have one and converted my 65 dart to disk in front from a 73 demon