[cdn914]

I have replaced with new parts: the points, the plugs (with NGKs), the cap and rotor, the coil, the ignition wires with OEM Bosch wires, the heat exchangers (new - expensive!), the muffler(another used unit), the ignition switch, the relay board (with a used unit), the complete distributor (with a low mileage unit), the alternator and regulator, the battery, the carbs (with rebuilt identical Weber 40 IDTs), the fuel filter, all fuel lines, the gas tank, the fuel pump (new)(fuel flow and pressure are good), the fuel tank cap, and air filter. I even have removed the screen filters in the Banjo fittings on the carbs. There is nothing left to replace. I have had the carbs adjusted by a local expert twice in the last couple of years. The car will idle perfectly and accelerate but the popping from the tailpipe persists and eventually it starts to miss again. The ignition timing has been set multiple times. The only constant seems to be that no matter what I do or change, the exact same problem persists.