15 inch rims fitment

[ricer]

anyone here have 15" rims on a 67-68 f-body (mini-tubed)? I changed up my plans and want to run a 15 but undecided between a 10 vs 12" wide rim.

The rim is a true 10 or 12 inch wide from outer lip to outer lip and with the mini tub it looks like I can fit them but not sure about tire bulge/flex while driving if it will hit. The tire will either be a 325/50 or 295/55.