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Factory Replacement Case?
Just like your photos, I have noticed casting date circles on many of my engine parts. The blank case tends to indicate a "factory replacement" case. I have heard about many blank replacement/warranty cases were re-stamped in the back room with the proper engine number for the vehicle in the early/mid 70's. I have a factory replacement AL 930/C3 case that is still blank but has a casting date circle. Just M2CW. Best of luck.
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