The + side of the coil is attached by a wire to the starter solenoid or a ballast resistor mount on the firewall. There may be a wire both from the solenoid and the ballast resistor to the + side of the coil.The - of the coil is attached by a wire to the distributor. When cranking the ballast resistor is bypassed providing a full 12 volts to the coil. When running the ballast resistor reduces the voltage to the coil to 9 volts. The points should be gapped to approximately .016 inch or the thickness of a business card. The dwell should be approximately 29-32 degrees of dwell. The points are gapped when the rubbing block on the points are on the high side of the distributor cam.