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A stock B20 is identical to an OBD2 B18B swap. Except usually you will need to replace the stock intake manifold with aftermarket or at least a stock B18B manifold since the original one won't fit under a Civic hood.
IF you are converting to OBD1 there is nothing special about the install or wiring under the hood that you need to do...just get your OBD2-OBD1 conversion harness and plug in your P75 or chipped P06 ecu. In some models, converting to OBD1 ecu will make underhood wiring even easier since there are some steps you can skip that are necessary for OBD2.
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