first, you are in the wrong forum.
second, find an ECU from a 90-91 integra (PR4) and stay OBD0
Pro's - easy... cheap... reliable cuase its how the car came. I swapped a 98 B20B (OBD2A) into my 90 Integra (OBD0). Im running OBD0 and dont have any problems...
Con's - not as easy to tune...