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Having more closely examined the photos, realize that what I thought was gasket is actually part of the housing itself below the cover.

I figured it was an 8.5 according to your diff ID photos, and the fact ID indicates Regal (same as Century), Cutlass, Grand Prix, Malibu, 73-77 use this rear end. Took photos with car jacked up, no hoist here. However, it matches exactly the photo of the tired looking open differential marked 10 bol...

I own a 1973 Buick Century with the original factory open differential, with 2:73 gears. Car only has 26K original miles. Original turbo 350 hooked to a J code 4bbl. 350 Buick motor. I want more punch off the line, so looking at lower gearing, but not too short for hwy cruising, and considering some...