The problem with carburetors rebuilt in a production environment is they do not keep the original parts together. When they disassemble all of the uppers go in a bin and so on. After cleaning each carburetor is assembled with mis-matched parts.
What is wrong with the carburetor off your truck? If possible, rebuild it with the kit and instructions from Carb King. If that is beyond your comfort level, take it to your local shop and see what they can do. These carbs can be rebuilt, the biggest problem is wear of the throttle body around the shaft, which is repaired by bushing the hole.
