The main problem with F20B swaps is the ECU. Most people use an H22 ecu, which is at best a good base map, but in NO way anywhere NEAR what the F20B needs to run optimal. I used an H22 as a starting map when I tuned my motor, and believe me when I say that the changes made to the map were BIG.I have personally seen 4 F20B swaps and different gen Accords running H22 ecus. The guys at the JDM shops had done an F20B swap in a CB7 Accord with an H22 ecu, and when I gave the guy a ride in my car he was really surprised at the difference.
Another problem is finding an authentic manual version. The autos came with 180 hp, and there is a VISIBLE difference between the auto and manual cams, along with the auto throttle body being a **** load smaller. None of this is speculation, by the way. I have personally compared, side by side, the cams of an auto and a manual, along with the TB. The pistons are the same in both. If the manual transmission isn't attached to the motor when you pick up an F20B, it came from an automatic car.