bad coil?

Where you've tried 3 different coils. Have you pulled a coil from a running car and tried it??? If you 'Know' you have a coil in hand that you know works, it will aid in troubleshooting.

It makes me wonder on wiring to the coil. Have you checked voltage on each side of the ballast resistor, coil and ignition relay wires?

Check when key is in start position and also when key is in run position. This could help you ID if it is another problem in the circuit. Doesnt happen often, but the resistor and/or the relay's can go bad.