Rear End Question(s)

You didn't say what car you were putting this rear in, but your pic is of a Duster or Dart Sport? Do you know if the Volare or Aspen have sure grips? If they do, I would go for that original plan. Not a direct bolt up, but a very easy change. You move the spring perches in a bit. I moved my rear back 1/2" by using a spacer block in front of the spring hangers. One of the members here sent me a step by step process, with pics to follow. Very easy.
I got mine from a retired cop car, sure grip 8 1/4, cop wheels, rear sway bar, etc.
One other benefit, if it is the Duster or Dart Sport, that wider 8 1/4 sure looks better than the hunched up 7 1/4 look!
C