You could pull the dist, and spin it by hand to see if you get a spark in both the start and run key positions, just disconnect the neutral safety wire from the start relay, or put trans in gear other than park or neutral so the starter does not spin when in the start key position.
If you get spark spinning the dist by hand in both positions, the problem is not the ignition or the wiring to it, but a problem with voltage drop when the starter load is applied.

If you don't get a spark spinning the dist by hand, then there is a problem in the wiring, dist pickup, or with the ECU.