I found a link to MDS:
http://www.msdignition.com/
You can download a manual from:
http://www.msdignition.com/downld1.htm
I don't know if you have the digital model of the MSD 6, I'm guessing not. There are many variations of the MSD 6.
A few notes, from what I've read:
-don't use solid core spark plug cables.
-if you have high RPM problems, look at a) coil or b) plug wires.
-it is possible to use two coils.
Let me know more, and we'll fix you up!