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You could, BUT THEN the choke would begin to open as soon as the ignition is switched on.
Looks like some engine degreaser will help
I have a simple question, was your truck not originally equipped with an electric choke? My 1981 C10 was, and if you could find that wire couldn’t you use that? Maybe give a wiring diagram a good look and see if there was one it would be on the diagram and it would tell you what color the wire is, then you could look for a disconnected wire that color near the carburetor?? Just a suggestion.