Need help with some connectors and getting my car started

That connector is "big trouble." Factory added it along about 72/73 to facilitate engine install. Best thing you could do is bypass all of it.

What do you have for ignition? Is this factory Mopar electronic or what? I WOULD NOT start by checking spark at the plug. "Rig" a spark tester, you can buy them at any automotive joint, and use a solid core coil wire to test, NOT a resistance wire. Crank engine using the key, NOT by jumpering starter relay. Coil should generate a nice, blue, snappy spark at least 3/8" long and typically more like 1/2"

Pull cap and rotor. Inspect cap for moisture, metal/ carbon/ ick tracking inside, and inspect rotor for "punch through" both top and bottom

Check for dist. shaft play, and examine reluctor/ pickup for strike damage, rust, debri

If no spark, pull all ignition connectors.......distributor, ECU, and resistor, and work them in/ out several times to feel for tightness and scrub them clean

With key in "run" take the engine harness end of the distributor connector.......not the distributor end, and tap the metal exposed terminal to ground. Should generate a one "snap" spark from coil each time you do so

Have you tried a little fuel/ starting fluid down the carb? Inspected the plugs for condition, fouling?