You dont need a resistor box if you use OBD1 injectors. You dnt need a wiring harness - rewire your original. With a P28, you need a OBDo to OBDI conv. harness

I have:
Complete Intake manifold w/Throttlebody and Injectors and sensors
Complete Distributor(TD-02U)
PM6 ECU
OBDI injectors

$150 for all. pm me for contact info. located in woodbridge 22192