spun Vtec

im putting a d16a6 in my ef civic and i know you guy's are the one's to ask about this motor
with that said.

ok i know that everyone says go obd1.

how am i limited if i use an 90 teg ecu with a vafc and stay obd0?
what are the advantages of going obd1?
i know engine management is a key but im not shure if im going all out on it like i think i can pull some decent number's with the obd0 setup and then i can always go obd1 later on.

i have heard of the obd0-obd1 harness what other mod's go along with this harness? i would like this thread to be as imformational as possible. i tryed search but if anyone knows any good threads on this subject please post a link

thanks alot

-larry