Ignition issue

If it passes the one-spark test,
AND the ECU is well grounded,
AND both sides of the dual ballast are working,
BUT the coil does not spark while the distributor driveshaft is turning, then there is nothing wrong with any of the parts except the magnetic pick up..... or the pick-up is not being triggered by the reluctor. Either way the ECU is not seeing a trigger. The easy button is to just sub in a known to be good pick-up.
If you have a Dual-Ballast System, with a 5-pin ECU, both sides have to be working cuz the ECU is powered up differently in crank-mode from run-mode. In crank mode the ECU gets its power from BOTH ballasts in series.