Holley 1920 carburetor identification HELP!!

Ok, so, i have 2 1920 holley carburetors, and for the month ive been researching this and i just cannot figure it out..
Im attaching 4 photos, they include 2 pictures of each carburetors and the numbers stamped on them. If anybody can tell me which number is the LIST number that is used to find a rebuild kit i will be more then forever grateful!!!