The Megasquirt guys (
www.diyautotune.com) are local (Suwanee, GA) and I hear they are very close to offering engine management computers for the LT-5. They told me recently they just need to test the last firmware version. As you say, it can control secondary butterflies/injectors, coil-on-plugs and more. That's pretty great news, not only for folks wanting to modify, but also considering the lack of GM computers available if one goes bad.