Hi,
The only difference between a CA version and a 49 state version is the hole for the closed crank case tube, so you should be able to modify one.
Also the upper is the same for a 2v or 4v just the tin label is different, also 64 has a different style snorkel not sure, but 66 and 67 might be different as well.
As for base, Chevrolet used the same style only the upper may be slightly different 64-67 I believe.
If I can find the one from my CA 210 air cleaner I will post a few pictures for reference
Good luck with the search
Regards,
Jim