I found the issue from MSD's instructions. I had forgotten about this:
"Next, lets review the coil wiring. The ONLY two wires that should be connected to the coil are from the MSD. The orange wire connects to coil positive while the black wire connects to the negative terminal. No other wires should be connected to the coil terminals! Also, do not touch or connect any tools to the coil. With the MSD connected there will NOT be voltage on the coil terminals unless the engine is running – and in that case there will be over 450 volts due to the CD technology of the ignition. Again, the only two wires connected to the coil are the MSD Orange, positive, and the MSD Black, negative."
I guess I'll have to find an alternate power source. Don't want to risk getting a traffic ticket!