Do you have a Rochester carburetor that has a center post for mounting the air cleaner?

I do not know about those standard Rochester air cleaners.

If you have a carburetor that allows the air cleaner to clamp around the top: oil-bath and oil-wetted air cleaners were standard equipment (or optional equipment) depending on the size/model of the truck/engine.

Once you know what you want/need, post a Want Ad in the Swap Meet.