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Hard to say what you can put under it for tires until you finish the tubbing, and whatever axle narrowing you might do. Once that's all done you can measure from your hub surface and figure out what you have for clearance, plus what offset you'll need.
I use a simple piece of wood bolted across two axle studs. Make it long enough to swing inside the rear wheelwell, and it will allow you to measure the max diameter of the tire, plus measure in and out from the stick to get total tire width, and offset.
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