Check the fuel dilivery system. Some times people put a filter in line between the pump & carb. Check that & any filters in the pump or in front of the carb. Check the pump pressure & blow out all the lines. If all that is good you need to put a kit in the carb. What carb do you have? It is probably a Carter W-1. The regular parts suppliers don't have kits for that one any more. It has to come from a specialty supplier.