Stock size was an F60X15, a 235/60-15 is equivalent in modern tire sizes. I have 245/60-15's on my car. And a 255/60-15 will fit. As far as lowered, I would think a 255 may rub because of the tire height. I think 245s will safely fit and not rub in the front. I say this because my car sat pretty low with worn out small block springs, and didn't rub.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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