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If I was judging the car (and it was a Holley), I'd want to look closely at the carb date if it indicated the same build week as the car; it's possible, but not "typical" of factory production. It would be more likely if the car was built on a Thursday or Friday. The car's build date can be estimated within a day or so either way from its VIN, but Holley carb dates only isolate it down to a given week, not to a day.
Anything that shows a part number in the A.I.M. was installed at St. Louis, and the NCRS judging standard allows up to six months prior to the car's final assembly date for dated parts.