For an 83/84, there are 2 connectors on the ECU and a third to the body loom, then one screw holding on a pair of grounds, IIRC. Then you can pull the grommet out of the firewall and pull the intake-side loom out. There's a few other wires that go to the distributor and coil on the other side, those are harder to remove cleanly.
Also, wrong section, you've put this in with the wanted ads.