(1) pull the yellow wire off of the "ign" terminal on the starter relay to disable the starter (no need to run the batt down). (2) hold the coil secondary wire (dist end) 1/4" from the intake (ground). (3) seperate the dist pickup zigzag connector & drag the male terminal on the closer to the ign box half across the intake to make/break ground & see if that produces sparks while a helper holds the ign key to "start". If it sparks the prob is in the pickup: continuity/gap/open in the 2 wire connector. If it does not spark plug the zigzag connector back in & take off all (maybe only 1) wires from the coil negative primary terminal & with a jumper wire ground that terminal (not the wire you removed from the terminal) by tapping it on the intake & see if the coil wire makes sparks same as before with the key held to start. 2 terminal (single) or 4 terminal (dual) ballast?. If a 2 terminal jump across it & see if it will start (several seconds only) & if 4 terminal jump across the downstream end so you have a loop on both ends & see if it will start. With a VOM see if you have fire at the bulkhead terminals, the ign2 (brown wire crank circuit). Might be as simple as the ECU died. Holler back when you can