Demon rear tire/wheel combo question??

I run a 275/60/15(28") tire on an 8" wheel with 4.5" backspacing, suspension was all stock last year in stock location, this year I did add the Dr.Diff kit that moves the leaf springs in a half inch for a little more room. Rear wheel opening is stock.
I doubt a 10" wheel would fit my car without jacking up the rear height.

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