Trying to get a rebuild kit for my 1966 2bbl Carter BBD.

NAPA lists two of them.

1) Carter C-2,w/ Carburetor # 4125, 4126, 4127, 4128

2) Carter C-2,w/ Carburetor # 4123, 4124, 4463, 4947

The only problem is that I can't find any of those numbers on my carb.

All I've found is 1781 on the side of the bowl, 1984 on the side of the upper part (IIRC), and a 1936 on the bottom part. I think those might all be individual part numbers for each of the sections, and there's no tag on it.

So how does a guy figure out which carb kit is right?