Well if you want your car to run the best get the p28 (obd1 sohc vtec ecu). It is a fairly involved wiring process as you have to wire your car for two additional injectors and change the plugs over to obd1 rewire distributor for the additional two wires and use obd1 pins rewire or use an ecu jumper harness for the ecu. You also have to switch around a few wires and add the vtec wires four wire o2 sensor ect... Be prepared.

you will need both your dx engine harness and the d16z6 harness.