Need the Carb King!! 64 273

Greetings, I have a 1964 Dart GT 273 4 speed Convertible.
At some point, it's carb was replaced with a later one, it seems. I would like to buy the right original year, or have the one I use rebuilt to work again. Does it matter if it is not the same year as the engine? I have had fitment problems with the choke blade,etc. I guess it just needs a CARB person. Any suggestions? Buy Or
rebuild?
thanks Brian. Santa Rosa, CA 707278-3712