Selecting the most accurately dated AVS carb casting

My fender tag build date is 2/26/69, my carb is an A9 (Jan. 69) the engine cast date is 12/10/68, body stamp date is 1/30/69
Great comparison. Production dates are fun to study. The Carbs were made at Carter and probably warehoused there for a time until they were sent to Mopar's warehouse where they were warehoused until they ended up on an engine. That engine was warehoused until it meets up with the rest of the car. You can see the timeline there.