The Holley Model 1920 was a 1 barrel downdraft carburetor used on Chrysler Corp. Slant 6 engines, as well as some AMC, IHC and Kaiser Jeep 6 cylinders and IHC 4-196 engines.
Model 1920 carburetors are normally stamped on the top of the main body near the float bowl. How to find Holley carburetor list numbers