Ok now what!!!!?

Run a 14 awg jumper wire (alligator clips) from BATT+ to coil+. That bypasses the ignition switch, bulkhead, ballast, and wiring. Testing only, the coil will overheat and misfire in ~5 minutes if you keep it like that.

Get a $4 in-line spark tester (Harbor Freight). Even if you sell the Dart, you can use it on almost any car with plug wires.