Go to www.racetep.com and enter their site and find the carb drawings they have a great exploded view of the 40's, the parts you need to record the sizes of, for starters, are going to be numbers 11 air corector jet 13 emulsion tube 15 main jet 16 idle jet 17 aux venturi and number 22 main venturi, report what sizes these are please. I kinda think you have something pretty simple assembled wrong like the aux venturis in backwards.