I run a 275/60/15 MT pro drag radial on the rear of my 71.... 8” rim with a 5” backspace. No need for a larger tire.
I have tried larger tires with mixed results...rubbing on the inner wheel wells and exhaust pipe. Mostly on a hard launch.
My car is not jacked up so your mileage may vary some
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71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile
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