15x8 w/3.75" backspace question

Furious65 said

I would use any tire that would fit! I just want to drive it this summer and don't want to spend money on rims that aren't going to stay permanently. I have these rims, bought and paid for back in '97, and they aren't being used right now. Car does have SS springs holding a Strange S60 so it does sit up just a bit but not much.

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In the front with 15x7 with 3.75" backspacing you'll need 205/60/15 or maybe 215/60/15 will fit, but close on a 67-69 Barracuda

Since the rear is up with SS springs, it's you're call if wheels are going to hit some big dip and rub the outer wheel lips. Some SS spring set different than others. 245/60/15 might be safe. You'll need to mock up and make a call.