well not as simple as that. i am assuming you have the single overhead B20A3. the next step up in these preludes is the B20A5. this is a 2.0 dual over head cam(DOHC) 16 valve motor. it is fuel injection. the A5 makes 140hp @ 5800rpms and 125 ft lbs @ 4500rpms i beleive. after the A5 is the B21A1. this motor makes 140hp @ 5800rpms and 135 ft lbs @ 4000rpms i beleive. the intake manifolds on these motors will NOT bolt onto yours. read this article from Squishypanda-
S --> Si swap. Lotsa pics. - Honda Prelude Forums
After that motor is the japanese domestic market (JDM) B20A. which has the same specs as the B21A1 but 5 lbs less torque. then there's the JDM B21A which makes 147hp @ 6200rpms and 140 ft lbs @ 4500rpms. then there's the european version B20A7 which makes 150hp @ 6200rpms and 135 ft lbs @ 4500rpms. best combo for these motors is the B20A block with the B21A head. swap in a B18B intake cam (gear side shortened to fit) from the 2nd gen Integra. B21A intake manifold. B20A7 pistons ( they have the highest compression for all these motors @ 10.5:1). and throw on the '90-'91 tranny.