Take a BIG clip lead. Make one if necessary...........out of no 14 wire. Jumper from starter battery post direct to coil + terminal while cranking and see if spark "comes back" or engine will start.
Also have you checked high tension coil wire with an ohmeter?
I can not remember which wire. If you ground one or t' other of the distributor connector to ECU wires, with key on, the ECU will produce a spark each time. Try each wire.