What's the trim tag date of your car? The 67 L30/M20 Saginaw combo got a 10-bolt early in the year, and a 12-bolt late in the year. I have a May built car with the original 12-bolt so I know it changed before then, but curious if yours is earlier than that.
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Jeff Helms
65 Z16 Survivor
65 Z16 drag car
66 Chevelle L78 unrestored
67 Chevelle L78 unrestored
67 Camaro SS350 Survivor
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