Idle Too High

Finally got some time off from work and had some time to mess with this thing. I had my suspicions that this carb had been messed with by the previous owner when I discovered the choke linkage was not installed correctly. So I pulled the carb off today and sure enough, the throttle plates were not closing all the way. After disconnecting all of the linkages to make sure they were not the culprit, I removed the throttle plates just to make sure the shaft would in fact move further in the closed position. When I removed the throttle plates, I noticed that one of the screws was different from the others. This confirmed that the previous owner had in fact messed with this carb. So when I went to put the throttle plates back in, I installed them so they would be closed as much as possible. Then I shined a flashlight from the top of the carb to see just how much they closed and they closed a lot better than they did before. Reinstalled the carb and now I can actually dial in my idle using the idle adjustment screw. Thanks for all of the help.