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You will need an OBD2B ecu a P28 to be exact, unless you are going to tune then you will want to get an OBD2B to OBD1 harness and run an OBD1 ecu. You will also need dizzy that will go with your ECU so if you go with the OBD1 get an OBD1 if you go OBD2 go OBD2 dizzy.
Stop!
Wrong information wTF?
There is no obd2b p28 ecu.
Why would he want to keep an obd2 ecu for one, for two, why would he need a conversion harness?
Use the injectors/distributor and alternator from an obd1 B series (del sol DOHC VTEC)
Get the harness from the Si and the harness from the VX and wire it/cut splice/add etc.
Do not try to keep your car obd2, do not go looking for an obd2b p28 ecu.
My suggestion is a chipped p28 (obd1 obviously) and wire the car up.