i am running 275/60s on 15x8 ralleys, with no trouble. They do crowd the width a tad, but leave a full footprint when the clutch comes up  if I remember, the tread width is 8.8" on the 275/60, which would indicate that a 9" wheel would be about optimum.....but anything from 8-10 is fair game. crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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