Black Edelbrock Pro-Flo round air cleaner for popular 5-1/8-inch carburetor necks. The 10-inch assembly uses a 2-inch paper filter element.
 
The paper element filters incoming air at the carburetor. A knockout in the base accepts the separate 1205 adapter to connect a crankcase-vent hose, and the supplied retaining nut holds the assembly together.
 
Black powder-coated finish. 10-inch diameter and 2-inch paper element. Includes lid, base, filter element, and retaining nut. Crankcase-vent adapter sold separately. Part 1203.