you don't HAVE to go obd1, however it is highly reccommended. obd0 ecu's are a bit buggier when dealing with fmu's like hondata or crome, you can get a straight chip but with a turbo I'd get something that can be retuned easily. It is well worth the money to go obd1. as for injectors, that depends on how much boost ( don't forget the fuel pump needs an upgrade as well). You do not need the msd box as hondata and crome will retard the timing ( if needed) and change your fuel maps as neccessary...same goes for the safc, you don't need it and I don't reccomend it for a turbo'd motor. the stock b18 can handle up to 15psi with great tuning, 12psi with good tuning, but most people I have talked to don't push more than 10psi even with excellent tuning, this allows a buffer between max capable and what you are actually running.

your next ? may be what do I need for and obd1 conversion? you need obd1 dizzy ( vtec if the head is vtec) but the b18b1 is the ls motor ( if I remember right) so the non-vtec dizzy in your case. you need a 4 wire heated o2 sensor, an obd1 ecu that will run on your motor ( I believe the p28 will work but check with punkinterviews or mtber for sure) and last a conversion harness from jkobd.com this takes your cars stock harness and converts it to match the ecu, this avoids you having to hack your stock harness.