Man, that is a really odd carb. I think it belongs on this odd Model A intake manifold.
The louvers act as a silencer and as an air cleaner. The air is spun around as it enters, and throws the dirt to the outside where it falls to the bottom. The bottom is easily removed to dump the accumulated dirt by just spinning the thumbscrew loose and swinging the bail wire to the side.
Have you tried to use the carb?