Help Firing Dad's Dart up Again - SOS - No Spark After Hosing Off the Dust

Well, most everything is done, and they're too the point of trying to fire it off. They don't have any spark and are brainstorming ideas why they may not be getting it. New pretty much everything in the ignition system: coil, ballast resistor, wires, plugs, cap, rotor, ignition module. She's cranking over good, but just no spark to fire. Feel free to chime in with any ideas of what to check next. 1974 Dart Sport with the Slant 6. As far as I know everything is pretty well stock on the car other than standard hop up parts from the 70s that wouldn't affect ignition.