There is not a lot of data out there on original A12 carb dates versus VIN or BIW. With this said I think you are safe with finding a center carb in the 1019 ish range as you mention for your car.

The latest production line date we have for A12 carbs is 1289. The later dates are believed to be OTC, parts department pieces. I am looking for an early 0729 4394 carb if you have an extra.

Drop me a PM here if you would like to discuss more.

D