There are 8.5” rear ends that will bolt in to your 66 a-body. They are out of 1971-72 Buick & Olds a-body cars. There may be a difference in width of about one inch, but this usually doesn’t cause any problems.
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1994 Formula
535ci NA CV-1 - single 1050 with c14 - 940hp@7000/825tq@5200
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