So, after reviewing the routing of the wires, I decided to take a different route -- I used the 'back' area where the wires were already routed, and flow the wires that way:
I then spliced into the FPCM wire (noted by the fuse location) and spliced the MSD into the circuit -- a bit of cleanup:
Did a test to see what the MSD 2351 is doing with ignition off.
Before I hooked up the charger, the MSD flashed 21 and 31 codes. Once the voltage got up to 13.7 (above the 13.5 I had set in the programmer), it flashed 13 -- which is normal for ignition off. Here is a youTube of the '13' flashing:
Next, routing the vacuum line to the front and then, the lower manifold...
-Don