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honestly, a p28 is not a good choice for that motor. i'd throw a p75 ls computer on it, and chip it to run a little less fuel with the displacement multiplier.
all electronics must match the ecu... so if you're using an obd1 ecu, you need an obd1 dizzy, vss, alt, injectors, remove the resistor box if its attached, and THEN play with everything that doesn't reach, line up, plug in, or remotely look the same.
you'll end up spending more money and a hell of a time... all because you're stuborn and initially tried to save a few bucks. in the end, its NEVER cheaper. it always costs more.