I'd go with the 255, that's what I put on the rear of my old 68 Camaro that had 16x8 wheels. It will have minimal effect on the speedo but still gives you more tire contact with the road to help handling. The 265 might be too much for the 8" wheel.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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