Hei woes

What I would do is unroll the harness wrap so you can strip out the ECU and distributor wiring connections with a minimum of cutting. All you eliminate is one power wire to the ECU, and the wire coming to the ECU from the resistor. That's TWO

The two distributor wires make three and four

the wire from ECU to coil NEG make the FIFTH

If you do this right, you will end up with the ECU connector still connected to the distributor connector.

You will have the wire which went to the coil NEG still with the eyelet

You will have two wires from the ECU connector up to the resistor connections which are now cut

So now the ECU is gone. You can leave the original coil+ wire this will become your new power wire for both the coil and HEI

Now just splice everything that was at the resistor together. There should be nothing "left over"