ONE AND ALL
I hope this might work for a few with the same problem I had.
93 GC no start because no spark to plugs. Did have spark to distributor, nothing further. Good gas pressure at engine.
Replaced computer, Crank Sensor, distributor and cap/rotor, replaced ground on battery end, cleaned ground on fender well. Still no start and no spark.
Traced ground to engine, took battery out, checked ground wire all the way to block, and then removed rusted cable off of block. Cleaned the bolt on engine, cleaned ground end put on some dye-electric grease, put everything back together.
Turn of the key and it ran like nothing ever went wrong.
I hate grounds.
Cheers, I hope this helps.