From the 87 fsm, vol 2 page 8-53, Ignition system:

To coil - : WL/B, 1.25L
To coil + : unknown color wire from top of resistor
To bottom of resistor: 2BW, 1.25BW
to top of resistor: 2BW

color codes:
B=black
W=white
L=blue
R=red

The numbers represent the thickness of the wire, bigger number is fatter wire in mm^2 x-section.

2BW will be hot in ign run, 2BR is hot in ign start only.
1.25BW and 1.25L come from the dizzy.
WL/B goes to tach.

The resistor drops the coil voltage in run to prevent coil overheating. If you use an aftermarket Accel Supercoil, you can delete the resistor and run 2BR and 2BW straight to the coil+.