Carb experts, I need your help. Let me set the stage – recently purchased a 77 Jimmy 350 w/ a rebuilt carb from a 1974 Chevy (based on the # 7044526). I am having trouble starting it up so I thought I would check the choke. After referring to my Haynes/Chilton, I tried to close the choke completely (make the choke plate appear flat) but the best I could do was to get it on a 45 degree angle. The mechanics of all the levers would not let me close it completely. Has this ever happened to anyone? Any ideas?