My educated guess is that it's from a 65 full size car. The "J" in the partial VIN would be for the Janesville WI plant, where they built the full size cars. A, B, or C wasn't used back then. Colvin's 65 - 69 book lists the 3851325 main case only for the 65 models.
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Bill Pritchard
73 Camaro RS Z28, L82, M20, C60
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