http://hybrid2.honda-perf.org/casmog.html

basically u need to bring you car to a BAR inspector to make sure you have a usdm motor thats the same year or newer than your car. if you still have all the smog equipment intact and your obd stuff works fine, then he prints out a sticker you put in your door jamb. when they smog your car, they'll know that u have a legally swapped motor.