Wow you should really know what the hell your doing ahead of time before pulling the engine out and wanting to through in a b16a2. Honestly, if you don't have a clue on how to convert to mpfi then how are you gonna convert OBDs? (Assuming your not gonna run a obd2 motor in obd0).
I'll put it up just cause i'm bored as hell:
http://www.fourthgenhatch.net/mpfi.html
Search next time.