79 300 no run?

Your problems are common to A-bodies, given the ignition mod.s Many, many posts on here about "no spark". Run a dedicated ground wire to the case of your ECU, don't rely on the screw. Make sure your engine is grounded to the frame and BATT-. Use an ohmmeter and measure the voltage difference in grounds while cranking. For the future, buy an in-line spark tester ($5).

I doubt that applying BATT+ to coil+ damaged your coil. I did that to drive my newly bought 64 Valiant home when it died (later found jury-rigged key-switch wiring). After 5 minutes, it started missing above 45 mph, but would idle OK. I touched the coil and it was very hot (and smelled burning plastic). I jumpered in the ballast and it ran fine the 80 miles home. Given that, unless the oil blew out of your coil, I doubt you hurt it.

Can you post a photo of your bulkhead connector? I don't know what the Cordoba uses. That is a common problem in A-bodies. If OK, next suspect the ignition key or the ballast resistor. I know that GM eliminated the bulkhead connector in 80's TBI trucks and just run the wires straight thru. I haven't checked my newer Mopars, but they might be the same.