ballast resistor wiring diagram
Here is a copy of the wiring diagram on MyMopar.com for a 75 Dart. Becareful of the 73 and 74 diagrams as they have an extra wire in the circuit from the ballast resistor to voltage regulator (brown wires) that will result in a constant 12 volts to the coil. I don't know what the colors are on the EZ kit but for your car the blue wire is Ignition 1 (Run) and the brown wire is Ignition 2 (Start). On the referenced diagram these are the two wires routed between the heavy black (going to the alternator) and the coil. Not knowing the EZ kit puts me a disadvantage helping too much.