The 8-pin GM HEI module and coil is easiest and cleanest, and will give more spark than your factory ignition. Can toss your clumsy 4 terminal ballast resistor. TrailBeast here sells a new kit for $99 or cheap at the junkyard (85-95 GM V-8 trucks).
I think i'm gonna try my luck at the yard or get a cheap module off rockauto. I did a little google searching on the topic and i'm probably gonna go that way. It looks like i'll be into the whole setup for maybe 50 bucks doing it myself. Which is a lot more appealing that 250-300 for a billet distributor.