You need to check if the coil is stright 12v or ballast.
Coil + to ign switched + (with no ballast resistor)
Coil + to ballast resistor (if ballast coil)
Coil- to distributor (points/condensor wire)
Ballest resistor has 2 connections 1 to ign switch + and the other to coil +
There may also be a wire from starter solenoid direct to coil + no matter if ballest or not, this is to aid the loss of voltage when starter is engauged.