You want to upgrade the fuel pump, definitely.

You also want to upgrade to higher flow rate fuel injectors. You can either get some RC 440 cc/min, or get used ones out of a turbo DSM for pretty cheap. To run the DSM injectors you'll need the injector harness and resistor box out of a non-OBD ('88-'91) 4-cylinder Honda.

From there you'll need a way to tune the thing. You can run an A'PEXi V-AFC with no sort of "hacks" by setting the fuel trim to around -35% across the board and then drive it to a dyno for tuning. That'll run like $300 plus tuning time.

Otherwise there is Hondata. An s100 w/ boost will run you $445. You will need to accquire an OBD-I ('92-'95) ECU preferably out of a VTEC car for Hondata to convert, and a harness to plug the OBD-I ECU into your OBD-II wiring.