1965 Dodge Dart 270 wagon

So finally time for the original carburator, Carter. Complete working cab that's never been apart. At least what I know of!
Glass beading, new gaskets, nos choke pull-off made it almost back to how it was when new. Does anyone know where to get that special gasket towards the air cleaner?
Next will be to move the shifting cable. The kick-down linkage does not work free!