[piecesparts]

With the engine cold, and on a cool day (not freezing cold)---The fall days are the best for this. With the air cleaner off of the carb, loosen the three screws on the choke housing and turn it back and forth, while doing this watch the choke butterflies and see what would make them start to move off of full open position. This should be close to where the choke should set itself and close for a cold start. Set the screws and work from there. When the choke is set, there is an idle screw on the drivers side of the carb (under the throttle shaft) adjust it to the RPM that you want the truck to run when it is cold. The adjustments from there can be made in small increments until you are happy. You do not want the choke plates to stay closed for a long time, that is where you get the rich smell from.