This was my 78 I bought and installed on my 76. It's been a couple of year but I don't remeber having to attach anything to the coil. I just connected the only remaining green plug (both sides) to the ignition wire that came off the old coil. That was it.
It was really easy. From the looks of yours the wires have been messed with. I don't think you need the wire coming from the solenoid. From what I can see you need to hook the ignition wire and the tan wire together and it should run.
Now before you do this let someone esle of experience chime in. Cause I've only done it once and that was a while back.