Carburetor parts for a 1964 273 spec 2 barrel

Hello,
I have a friend with a 64 Dart 273 that has developed some issue with his 2 barrel carburetor. He would like to know what options are out there for quality rebuildable cores.
He claims that the 273 carburetor is different than what was used on the 318s that came along in 1967.
These are pictures of his carburetor:

CF 1A.jpg

CF 2.jpg

CF 3.jpg

CF 4.jpg

I know next to nothing about the unique components in these carburetors but he says that it has to be a 2 barrel from a very early 273. There are no numbers on the carburetor except these:

1764142684201.jpeg

Model numbers were originally on aluminum tags that sat under a screw retaining the top cover of the carb.
He mainly needs a restorable baseplate but may be interested in a whole core if that is all that is available.
Thanks, Greg