carb issues

Trying to get my wife's 64 Dart road worthy for the upcoming shows. New spark plugs,valve job,points (set at .20) dist cap. Installed carb kit,idles great,but really no power and uses a hell of alot of gas. The carb has been vatted out 3 times.Went to town and back,around 25 miles and used 1/2 tank of gas!!!It will sometimes pour gas out the top and have to take top of carb off and drain carb. I am not too good at adjusting the floats,but that would probably be my next step. If I can't get this thing running right,can you buy rebuilt ones??? This is a Carter 1 barrel,it is so simple of a carb that I can't believe I can't get the thing to run good. Need some help and thanks Todd:violent1: