No Spark.

Here's something. Years ago I had a 340 in a beat up old FJ-40 Landcruiser, using Mopar ignition for awhile. We would "get crazy" in the mud, muck, rain, snow. Water would douche the ECU and short it out

WHY?

Easy. "That big transistor" is above ground on the "points" side of the coil and has some fairly high voltage. It WILL shock the crap out of you. Took me while, (back in the mid 70's) to figure THAT out