70 Duster ignition issue

^^THIS ^^ is why you should learn to troubleshoot instead of throwing parts at a problem. A simple test with a meter at the ignition switch connector, at the bulkhead, and at the coil+ would have told you whether you have CRANKING voltage at the coil or not

Ignition RUN goes "dead" at the key when cranking. The only power for the ignition is the "bypass" circuit known also as "IGN2."

Go to MyMopar download a wiring diagram and a factory shop manual.