how wide can you go

[1970C10truck]

Its time for new wheels and tires for my 70 c10. The truck is a project street and strip toy. I am curious how wide I can go in the rear on the stock width axle and trailing arms. I don't mind cutting the bed I just want to avoid narrowing the axle or any complicated suspension modifications at this time. Truck is stock height at this point but will probably end up with a 4 inch drop or something in the neighborhood.
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