I just purchased a 1960 GMC C60 farm truck. It runs beuatiful but has a terrible gas leak at the top of the carb float bowl. This is a 305 v6 and it has a holly 1 barrel down draft carb. All my other v6's have stromberg 2 barrels. It pretty grimey yet but I can't seem to see any numbers. Can someone shed some lite on this model of Holley for Me? Knowledgable sources for Kits and nformation? Other suppliers that still have parts for the old v6's. Thanks. Todd