69 cuda with 275/60/15

Is there any room in wheel size for more backspacing? or to the outside? I guess I am wondering if there is any way to get a 9" wheel under there with the same or more backspacing?
Thanks.

9" with more back spacing will need offset hangers. I had 15X8.5" with 4-7/8" backspacing and 275-60-15, had to move the springs but they tucked in nicely.