73 Plymouth Valiant no electricity

Hey guys sorry to jump in your post and hijack but I am having a similar problem same car 73 valiant 4 door with 198 motor. She cranks but no spark from coil, only occasionally when I turn back to off position I get 1 late fire that causes a back fire out of my intake. I replaced the ignition coil, ballast resistor, starter relay, an ecu I'm racking my brain but can't come to a solution