Demon wheel BS question

Hey guys I tried to find an old thread with info but couldn’t find anything that specific. I found an old set of cragar mags that I wanna run on my 71 demon. They’re all 15 X 7 big bolt pattern. The only issue I have is they have a 3.5 bs. Does anyone have experience with the 3.5 bs front and rear on a demon? I know 4” bs works on these cars but never seen 3.5”. No tires purchased yet until I find the right wheel setup. Thanks in advance.

For context I’m running a 8 3/4 rear drum setup and a later A body stock disc setup up front.