Fire in the Hole

Same here, but got the parts real cheap at the junkyard last Spring (GM truck 85-95 or 93-car). GM has a factory cable that runs from module to coil, so why not use that?

Why is your module on angle aluminum? Don't they give you the finned heat sink shown on their site (I used an old CPU heat sink). Not that a flat alum plate wouldn't work since GM just bolts it in their distributor.

Good that the wires from your distributor pickup to the module are twisted. That is important to avoid feed-back pickup. When testing mine by spinning the distributor I sometimes got "free-running" because I was using loosely strung alligator clips. The pickup was sensing the coil firing and self-exciting from "positive feedback".

The ClassicHEI works, but not much value-added and you can procure real cheap at any junkyard. If you do, leave some wires on the 5-pin connector for the future and grab the GM knock sensor & module while you are in there, since many after-market engine controllers know how to use that.