All SC's use the EEC-IV unless retrofitted to run with an EEC-V, and there would be alot of pain to that conversion.
If your interested in tuning, you can use the old EEC Tuner, but there is much more modern hardware and supporting software that allows you to tune your car more accurately, such as SCT, Tweecer, and Moates. The EEC Tuner is limited and you need to "scale" everything because not all the parameters are available to tune with it.
While BKB can run his setup lean like that, that is not a recommended practice for a forced induction motor especially if your daily driving it. AFR is just as important to keep your valves cooled as well as emissions control. It is general practice to target an AFR of 11.7 for forced induction motors running pump gas at high RPM WOT conditions, and around 12.3 or so for N/A motors. While cruising, having the O2 sensors working (closed loop) and keeping the AFR around the 14.7 to 15.3 which is what its designed to do is about where your going to get your best balance of mpg, emissions, and valve temperatures (as well as a few other things).
For that gain of a mpg and a couple of rwhp I'd honestly have to say its not worth the risk to run that lean for most people.
ps: this is not meant as an attack against BKB. I'm just stating what is out there and the industry standard way of tuning so to speak.
Frit