Theres nothing to roll.
Pick up a set of used c5 Corvette rear wheels/tires, which are 9.5" wide, with a 275's. Remove studs from hub, and use bolts with a stack of washers to moch up the wheel to the correct backspacing you need. You only need two or three bolts for moch up.
I'm thinking you'll need around 6" of backspacing. The vette wheels have 7.6" of bs, so you'll need at least 1.5" of washers. With that much bs, I'm not sure if they'd hit the control arms or tie rods at that point.
At this point, you can see if you want to notch the frame or not.
I used this method when moching up my wheels for fitment. Nothing works better then an actual tire/wheel IMO.
Let us know what you find.
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