i have a h23 engine but my friend blew last week and i have a good deal on a h22a4 but its obd-2 what u think i should do?

just add a vtec wire and chip the currently ecu?

buy a obd-2 to obd-1 conversion with a chipped p28?

or just put the obd2 harness and ecu?

buy a obd-1 h22 harness and ecu?

please let me know

thanksin advance