Can you ID this air cleaner?

[cortcomp]

This came with my 66 C10. The truck has the AIR system (from california) but most of the pieces are missing, and i was considering scrounging and putting it back on. This doesn't look like the air cleaner that i see on most trucks or in manuals, but i didn't know if it was different because it was with an A.I.R. truck? It does have a big nipple out of the bottom that the ugly PCV looking hose from the rear of the motor seems to go to.

Thanks!