Demon wheel BS question

I would imagine the rear would be fine with a 7" wheel. I wonder about tire selection with a 7" wheel on the front. My 72 duster has 15x6 on the front with a 205/60r15 and it looks like much taller clearance may be an issue.
I’m not taking about width. You can fit a 7-8” wide wheel no problem tire size depending. I’m asking about backspace specifically.