OK, I'm stuck...mostly because of my lack of knowledge regarding anything related too electrical componets. My motor (73 440) was running an orange box with an electronic ignition (distributor with tan cap) prior to rebuild. After rebuild there is an MSD Ready-to-run distributor installed. I am still using the coil that was on the car previously. The MSD is wired to the coil as instructed, red to positive, orange to negative, and black to ground (I have it grounded to the firewall now, but have also tried the valley pan bolts and radiator mounting bolts). The coil has the same wires hooked to it as it did before the rebuild, one additional wire (blue) to the positive coil terminal and two additional wires (one green and one black/yellow) on the negative terminal. I have no idea if the color of the wires is correct as it was all wired before I bought the car. I am getting no spark. I am testing by hooking up my timing light as I turn the motor over and not getting any indication of spark. What am I missing. Do I need to run a different coil? Is there another piece to this ignition puzzle that I am missing? MSD directions do not indicate any other wiring other than what I have mentioned. Please help!