New to forum. 1966 inline 6 was driving fine, then began acting as if out of gas despite tank half full. Checked each spark plug & they are working. Fuel pump sends gas up to carburetor. Fuel filter clear. Replaced 1 bbl carburetor, but that didn't fix it. Neither gas in carb nor starting fluid in carb works. The engine will sputter for a split second, then die. Any suggestions of how to proceed would be greatly appreciated.