18x8 w/ 5" bs and 245/40 tire on the front
18x9.5" w/ 5.5" bs (w/ disc brakes) and 275/35 tire on the rear or you can use a 275/40 to help fill the wheel well better on a 67-68, since it's a inch taller overall you will fill the wheel well a half inch more....but remember they will be taller than the front, so it's all in the look you are going for. I prefer for the front and rear sidewalls to be the same height....
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Tony
'68 Camaro
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