I managed to get 3 of the 4 mounting screws into the MSD box, think I'll just run a serial cable to the top.
Here's some shots:
You can see the ECU on top to the right.
This is where the ground from the battery ties to the frame, I grounded everything there, you can see the yellow connectors through the wires.
This is off the positive side of the battery, and is stock. I picked up the battery connections from here:
Here's the relay all hooked up:
Here's the wheel well back on so you can see how everything fits: