Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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The 12 bolt gear set is most likely a GM service (parts) gear set from much later. I've ran into similar inscribed numbers on NOS 3.31 12 bolt gear sets which I've set-up.
On your 12 bolt, am assuming the '70 is a factory 455 car, I'm keep track of original housing stamped dates & codes. If the lower right hand webbing of the center housing does not have an alphanumeric date code, would be interested in what your axle tube is stamped. Thanks!