My Ignitor met an untimely death when the red wire was yanked out of the epoxy potted module. I still have it in the toolbox, I might try to repair it someday (yeah, right). I left just a bit too much slack in the cable tie holding it in place.

I can't help with the MSD, I am using an Accel 12v stock look coil.

http://www.pertronix.com/downloads/ignitor12vneg.pdf is the installation guide for the Ignitor. You do NOT need to pull the distributor apart, but it is much better to remove it for the installation of the module as odds are that if you don't you will drop a screw inside the distributor. It's just like installing new points, but you have to use a different screw and route the wires through the grommet in the distributor body.