I think your last question is referencing the Roadrunner Emulator that the guys are using n the 512 -411 PCM. Craig Moates did make a Roadrunner work on a Blackbox PCM, but IIRC it was very very temperature sensitive.
The Roadrunner Emulator only allows you to make immediate changes to the calibration without reflashing, but you still need the Tunercats OBD2 or EFILIve software no matter what.
You could rip out your blackbox PCM and your 1990 TBI ECM and use an 0411 PCM to control your whole truck. Theres no reason why you cant use the blackbox to run the whole truck either, its just that fining places to recalibrate it are less common than the 0411 PCM. In other words, the Roadrunner would only save you time lost due to flashing the PCM's, as any changes you make via the TC2/EFILive are introduced into the calibration immediately. It doesn't prevent you from having to buy any tuning software. In fact in order to buy Tunercats OBD2, you must be a Roadrunner owner, or buy the 2 at the same time. I just checked at Moates and the Roadrunner emulator is currently unavailable.
http://www.moates.net/gm-1996present...-c-100_56.html
peace
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