91 Sedan, Questions.

Okay, first off..what front lip will fit on the 91 Civic Sedan, can the 90-91 hatch front bumper fit on a 91 Sedan? Which OBD0 computer is the best for this setup? 1.6L ZC, JDM Intake Manifold, Runners/Injectors, Full 2.25" exhuast system, flow cat/resonator, 4-2-1 Header.