I found a nice Slant 6 article I would like to share.

I saw that same ignition system w/ wires today on local craigslist for ~$300, but for a 440 engine. Seller said he paid ~$1000. Seems silly since you can grab a later 8-pin HEI module & coil from any 85-95 GM truck in the junkyard for easier & better wiring, and get a better spark. TrailBeast here kits those for ~$200 for those who don't do junkyards.