My 83 wagon has a SBC in it already. The previous owner put a 355 in it. The ECM is still in the car but the harness has been cut and hacked. Right now there is a plug with two wires on the rt side if the motor. One of the wires looks brown or tan and it goes to the ECM harness. It is connected to the harness with a crimp connection to 2 wires that look like theyre pink and pink with a black tracer. Theres also two wires that go to ground on the alternator bracket by the thermostat housing. What do these wires do ?