Factory 15x7's have 4.25" BS.
I run 235/60/15's on the front of my lowered '64 GTO (with disc brakes - which widens the track about .25") and clearance is tight.
On the rear I run 255/60/15's on the same wheels and everything clears (12 bolt rear - about 1" wider overall).
If I were you, I would be looking for 15x7's with 4.25 - 4.5" BS. For the 15x8's - add .5" (1" wider needs .5" more BS to put wheel/tire in the same position).
There are plenty of wheels available with that backspacing.
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