SN95 rear and wheel backspacing. S197?

I'm building an 84 Notch and am using a lot of parts from a 98 Cobra. I'd like to run a decent size wheel and tire in the rear, but currently have the SN95 length rear end.

In my experience a 15x10 wheel would be best with a 6.5" backspace on a fox. Since the Cobra rear is 3/4" longer each side I'm wagering a 7.25" backspace would work well.

It appears that many 10" wheels designed to fit the S197 chassis are 7.25" backspace. Anyone ever tried this already?

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Did you ever get anywhere on this? I'm in the same boat with my 1989 that is converted to rear disc also.

Same here. Thought about taking a set of SN95 17x8's and adding some width to the inside. 1 to 1.5"