Welcome From So Cal!
https://tiresize.com/height-calculator/Looks like your rear is 32" tall, sidewall is 6", and your tread width is 12"
I'm rebuilding a 1980 C10, and there is a lot of room in the rear, but you should measure yours.
It also will depend on the wheel and where the depth of the center line mounting plate is, relative to the overall width of the wheel.
Get your straight edge and tape out...
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