1500 5-spd MT. Auto choke functionsing properly. Carb either floods or starves to shut off[. Full OH kit installed. Needle and seats operating properly..not binding. Gas tank removed and cleaned. Gas lines blown out. New filters. Engine temp proper. Fuel pump checked o.k. Regulator put in gas line and adjusted down to 1# and problem still persists. Regulators on Air Horn connected and working. Starts and idles perfect but after a period of time, it either floods out or starves. Floats are good .. no leaks. Totally baffled. Any answers or suggestions greatly appreciated