1966 valiant ignition problem

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Also make sure that the yellow wire for the neutral safety switch on the starter relay has a good connection and is not corroded. Maybe disconnect it, clean the male and female terminals and reconnect and see what happens.

Be careful starting the car in moving gears (not park or drive), it will start and be moving in gear. You will have to chase it down before it crashed into something to stop.... If you must try starting it in gear, then jack up the rear tires so it cannot get away from you...

If it won't start in park or neutral, it should be your neutral safety switch or a wire for it that has lost its continuity.