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This casting number was from the early 60s and used between '62-'67 as original installation. It was used for additional years for service replacement engines, like yours.
CE engine codes can't really be deciphered much beyond what you already know other than the 4 infers that it was built in 1974, almost at the end of the 5-50 warranty program.
The CE program didn't start until 1968 and ended around 1975. Prior to that I believe a lot of replacement engines had nothing on the pad at all and were simply identified with a paper tag attached to the engine.