FWIW - IMO All 70 Camaros with M22 were small input and output, 71/72 was fine spline input large output. Guy I work for has a survivor 02/D 1970 Z28 with small input/output, he also used to have a 04C 1970 Z28 and it was small input/output also.
All Chevelle 454 cars with M22 were fine/large as stated.
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