66 dart rear end swap

Swapping out a 7.25 rear for an 8.75 is very simple. Can be alittle costly but it’s pretty basic. Would just need shorten driveshaft.
Thanks...I have a welder mechanic friend who is willing to do the work, but said will be a lot of time and work...ie fabrication and customization. He is a Ford and Chevy man (but I don't hold that against him..Ha) so he says he is not too familiar with the work needed...a lot of time figuring...he said I should have chosen something other than a unibody...Depression.