Another Strange Air Cleaner on 66

[Metalaroundstone]

My 66 Fleetside/327 came with this strange looking air cleaner. Apparently, the 2 barrel was swapped for a 4 barrel and this is the air cleaner the PO scrounged up. Does anyone know what this might be from. It looks like it should be an oil bath cleaner, but it does not have any of the interior parts. The PM threw an air filter inside that was just decorative. It had a full inch of space between top of air filter and top of cleaner. I am looking for an air cleaner that would be more original looking, even though this truck never came with a 4 barrel. Any ideas?

Also, in the carburetor pic, there is a vacuum line coming from the air horn that is not connected to anything. Should it be? Or should it just be plugged as it is now?

Thanks