I would say your best date would be 2 weeks to 8 weeks before assembly date. It also could depend on the build/assembly date of your motor.
So the date on the alternator is probably too late for your car, and I'm no expert on stamps but that looks like it could have been scratched off and re-stamped below.
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69 Chevelle SS L88 "Day-2" Lemans Blue
69 Chevelle SS L34 postsedan project-Azure Turquoise
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