Any seen an AFB with an AVS top???

That's just an early style AFB carb and not a mismatch of parts. It may even have the smaller neck size. Not the normally size were used to having. Mr. Gasket makes annadapter for it to use with normal air cleaners.

An old friend of mine had a '67 Chrysler Imperial, 440 cid engine with that very carb on top.

Most people do not beileve that a 440 came with the smaller 625 AFB back in the day. They always say no way, 440's only came with a 750.
NOT TRUE!

And yes I do realize that the carb has the 3 step AVS covers.