Help, my car won't get a spark

Actually, if you "hose down" either Mopar ECU or GM HEI, it probably won't run, either.

The heat sink and transistor on the Mopar is hot at coil NEG. This is high voltage, IE several hundred volts, and if you get it wet and dirty, it won't run. These "open air" HEI conversions are the same way.......only not as much exposed.