I have 15 x8 with 275 50 drag radials on my 69. so i know u can go that big. I wouldn't got any bigger than 275 though. Mine seem to just fit. there is someone on here that has like 300 something on his 70 mustang though.
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428 Cobra Jet
SOHC 5.4 3V F-150
96 mystic cobra
91 GT
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