What Is Wrong

Measurements sounds good and everything you mentioned.

Thinking you may have backed up at first with the wheels turned and caught the lower fender bending it in a bit.

One known trick for the A body guys that put bigger tires on the front is to lengthen that lower fender support rod just in front of the tire by 1", that will give you more clearance between the tire and fender.

Front lower support rods pictured here. Might have to tweek out the bottom of that close driver's side fender at the same time.

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