Read it and weep!
The 7.25" is 53.2" vs the 8.25" is 51.4".
http://www.moparts.org/Tech/Archive/axle/17.html
I have an Abody 8.25" in my '64 dart. Even with 2" drop leafs from Espo, my 225/50R15s on 15x8 cop car wheels don't rub! Backspacing is 4.5".
