Ok guys I have a chandler grove carb on my V-8 flathead,and there is two screws on the back of the carb towards the bottom,is one for the high speed ,and the other one for the low speed,can anyone give me some idea how to adjust these.The truck runs real ruff when it is idling,and sitting still.I know that I am in the wrong area ,but it seems that I can get some better advice here,my truck is a 1947 ,can anyone tell me how many years they made this carb??

thanks for the help guys!!!!!!!! Bill