I dont know if you figured out your answer yet but I just wired the same set up.
The red thin wire from the MSD box connects to the existing ignition wire that used to run directly to the positive side of your coil.
Instead of running from the ignition to the positive side of the coil it now runs from the ignition directly to the thin red MSD wire.
You should be able to find the wire near the Coil. That ignition wire should have 11 to 12 volts with the key in the on position but not started.
I cant remember what color that ignition wire is.
Thanks for the help.Had to get out wiring diagram to refresh my memory everything a-ok now.Purchased street pro-billet w/ 6AL box&8.5 wires ,SS Blaster coil.Installation was very simple & straight foward.Dist. came w/HEI style connectors on cap but socket type is available.Very pleased with everything.
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