The correct small block fork is GM # 3892632. I had that problem and replacing the fork (which sure did look the same) cured the issue. Also with the correct block to pivot ball distance which you said you have. Do you have a scattershield or anything non-stock.
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69 Camaro therapy program, 410, M22! SOLD
68 Camaro - SOLD
67 Bel Air - Hmmm.
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