I've had a MSD 6AL ignition box that I had in my old Toyota sitting on the shelf for years, and after a NYE escapade including too many wobble pops and relentless disregard for the amount of RPM the engine was turning, I thought it'd be a good idea to install it, just to have the rev limiter.
I'm only mentioning it here because it is a question that gets asked quite a bit on the Samurai FB groups, so here's a quick and dirty rundown of how I wired it.
The majority is self explanatory, hot to hot, ground to ground, switched hot, coil positive and negative, but what about the purple and green coming off the MSD box?
Under the rotor is are two electronic pieces...you need to bypass the igniter. Unscrew the red and white wires from the igniter cut the eyelets off, these will go to the purple and green coming off the MSD box. The green from the box goes to the red and the purple from the box goes to the white.
The picture of the distributor should explain what to do.
Its nice to have control over the limiter again!
Hopefully someone in need will find this info handy someday.