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I have an ‘81, same set up as your truck. It looks like your carb has been modified and messed with. I see vacuum lines plugged and the choke converted to a manual cable. Those carbs are fussy and like to be just like it came from the factory. Mine is exactly like a factory setup and it still doesn’t run smooth. Chevy did some kind of funky diaphragm air pump smog crap using the valve cover. Those leak and cause all kinds of trouble too. Id try and find either a factory original carb, there was one on eBay. Very expensive. Or maybe try and call the people at Nation Carb if they have a more simple one to substitute.
 
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