Think about a later 8.5" rear.Parts are plentiful.Check prices on both.I am working on my 67, found a 3.73 posi complete for 400$ out of a 75 F body.Had to move the spring perches the rear is ,I forget now I think it is less than 1/2" wider per side.I didn't want to destroy the original 4:33 rear.Good luck
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