Hudson wins the prize. That is the dual fire ignition module. You need to throw that shit out and get a single fire coil and dyna comp ignition module or similar. That's what we all did back in the day.Thunder heart ignition control module. Controls the ignition system. The serial port is for diagnostics. And both calipers are made by them as well.
The harness next to it is for the rear signals, tail and plate lights.