Should be plenty of room for backspacing on the back...
I have a set 8 1/2" autodrags with 4 1/2 backspacing and 245/50s in storage and I know they fit
the back, but I wonder if they would rub on the frame in the front :dontknow:
The car in the below pic has 8 1/2 autodrags on the front with 3 1/2 backspacing and 235 tires
but the front of the fenders are modified slightly to let them fit
For the back the white car in the pic has 295/50s with 10" autodrags and 5" backspacing but
that car uses the bolt in spring relo kit and a B-body rearend