8 3/4 identification help

Hey all,

Pulled a 8.75 from a 75 roadrunner parts car today. It has none of the common identification numbers that I'm used to seeing. My dart has them on the driver snout..this has nothing there.

It does have pinion snubber holes. HUGE drums. Same width as the 8.25 that also came from a late B body.

Is this perhaps a really early one? No gear ratio tags either. Going to need a sure grip, but Idk if the case is even usable, or what it is.

Thanks for any help.

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