The problem is that you’ve got an 8.25 or 7.25” rear axle. They’re not the same width as an A-body 8 3/4. In fact they’re about a full inch narrower. That’s a 1/2” per side that you don’t have, and that’s why those 275’s rub.
A 15x8 with 4.5” of backspace works for an 8 3/4 with BBP axles, not a 7.25 or 8.25.
Spot on.... I did relocate the D/ C weld on relocation perches, onto a original 8".75 " a body axle. It's tight with a 15 " by 8" , wheel ,with a 4 .5 back spacing, on a 275 BFG drag radial. It's tight ,but drivable
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Massage ...fender lips ,as needed...
