Holley 1920 R-4003B, 4162

All you need to deal with the remnants of the anti-ice system is a brass fitting with a hose barb on one end and an appropriate male-thread inverted-flare on the other. I don't remember what size thread/flare or hose barb you need; the hose barb is either 3/16" or 1/4"—this will be easy to find out by looking at the nipple on the underside of the air cleaner base plate. A well stocked hardware or plumbing supply store should be able to help you figure out what size flare you need, just going by the thread size in the carburetor base. Then just run rubber hose from the nipple on the underside of the air cleaner base to the hose barb on your new fitting. Done.