/6 stalling

Jerm, pop the top of the air cleaner off and leave the base of it on the carb so you can see the top of the carburetor. Now pull the throttle linkage down with your hand and release it. Did the choke flap in the carb close? If not then take the entire air cleaner assembly off. Now pull the throttle linkage down with your hand again. Did the choke flap close this time? If it did, then you are just getting interference from the air cleaner. Did you buy an aftermarket air cleaner or is this a slant 6 original?