Mopar 4bbl air cleaner- but what is it for?

So I was at the Stafford Springs swap meet a few weeks ago and an aircleaner catches my eye. No emmissions but a breather tube nipple. The marks are there for a manifold heat stove tube but it's not punched for that either. The guy could not tell me anything but it was on a 4bbl. I liked it and bought it. Now what the heck is it for? Oval push in single snout. Had any one ever seen one like this and what's it fit? Then I will know the value. Right now it is garage art. Really nice shape too. No emmissions or vacuum tube holes and from what I see totally unmolested.
Thanks!
Joe