I have a Holley carb that we pulled off my 1969 Chevelle L34. I have receipts that show them purchasing a O-6210 Holley in July of 1980. On the Holley I see the numbers L62103 followed by 8522. Trying to figure out what the date is on this carb. I know the L62103 probably refers to a O-6210-3 650 CFM Holley. Is the 8522 referring to a date or do I need to look somewhere else on the carb? Thanks for the help.