Hondata - Honda ECU Modification and Enhancement read up...fuel mapping, vtec, everything you can think of, even when the AC turns off by RPM, launch control and so, SO much more.
http://www.hondata.com/s300.html
Im running the s300 with the obd2 to obd1 conversion built in. Fully programmable from my laptop. One of the best investments I have ever made. [besides the b18c-r hehe]
BTW, I would recommend buying power over building it any day, buy the power K20, K24, B18C-R and tune it via hondata or your ecu of choice...just my personal advice...as building power is not as reliable as getting it stock. Plus your going to save money and time.
If your very good, then building it is good too, but you need to know what your doing, I mean you really need to know what your doing. Honda engines are built very well and efficient, getting more out of them is no easy task for NA.
Building the engine up for forced induction is different, going lower compression to help with detonation while beefing up the bottom end to handle the boost/hp is a different build in my eyes, there is much that can be had with this type of build.
Just my friendly advice...ive been doing this honda crap since 1992, ive seen it all. Started with d16 my first fully built engine, moved to b16 and now b18, its way better to buy power "out da box", if you get my drift. [got my eyes on a k24 now]
Happy hunting...