This might help. I think it's a 8.2 rear.That's what is in my 69 GP/428 3.23 rear. The 8.5 are Corporate rears that started in 71. not sure though. Please help this guy & myself. I could sure use this info also.
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10C 1972 Formula 461 non A/C
08B 1969 GP J/428 non A/C
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