I'm in the process of completely restoring my 86. For now, I've decided to keep everything stock, so it has a Holley-rebuilt Quadrajet newly installed. In the emissions routing on the carb, there is a "Canister Control Valve" (PN: 17085891) that I found on GMPartsDirect. Immediately off of this valve, there is a small "Check Valve" (PN: 25518739) that I can't find anywhere. I was told by Autozone that it may come with the new canister control valve.
Does anyone know where I can get this check valve for certain?
Trickster was able to dig up some info for me. The check valve was discontinued by GM and is now ACDelco part# 214563. Just in case anyone is looking for it (I think I'm the only person here trying to restore my emissions and AIR system), here's a picture and it's location in the system: