I'd go with a new BOP (not the chevy version) Eaton 8.2 posi as it's rebuildable. The old OEM cone style posi wears out over time and can't be rebuilt.
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1969 TA RAIII M40 Auto Cameo White/ Std Blue Int
1970 TA RAIII M21 4-spd Lucy Blue/Std Black Int
1971 TA 455 HO M22 4-Spd Lucy Blue/Deluxe White Int
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