You can't "chip" an OBD2 Honda ECU. If you want to go that route, you need to find an OBD1 ECU, an OBD2 to OBD1 conversion harness, and reputable source for an ECU program (Kenji Plennert is one of the best).

You can also get a VAFC that will allow you some control over the fuel delivery and the ability to switch the cam crossover point.