Dead ignition

Pretty much above. You can in fact download a free 73 manual (in two parts) from MyMopar. By the way, those came from guys here on FABO, as did a few others posted over there

http://www.mymopar.com/index.php?pid=31

Bear in mind there are TWO ignition terminals on the switch. One, IGN1, is the "run" and is hot ONLY in "run."

IGN2 is the coil resistor bypass in starting, is only hot in start, and IS THE only source of ignition voltage during cranking.

Did you replace the switch because it quit? I would suspect the switch itself, the switch connector, the bulkhead connector.

YOUR CAR may have a white connector under the hood which separates the engine from the firewall. Others on here have suggested bypassing that connector