jeep cherokee rear in A body

hope everyones holiday was great, have a 73 dart looking for 8.25 rear swap, checked junkyards seems jeep cherokee rears are pretty close spring perches 43" ccenters ,355 gears , u pull it price $60.00 years i saw 95,96 1 shock mount relocate needed front to back , anyone try this rear? also read can swap posi unit from grand cherokee ? would be cheap alternative to i can't seem to find 8.25 or 8.75 for A body and some i've seen at 1800, can't afford that , any replies would be great thanks