Just a thought and maybe I missed it but did you say you put the 350 fuel injectors back in?
I would suggest using them. Its very common to get a rolling idle with lean condition. Its only a coincidence that
it runs "OK" with the 4.3L stuff. Use the 5.7L ECM/injectors. Again its the Tune not the hardware at this point.
Again as mentioned the EBL flash is a perfect option for this project. With your ability you could have this thing running very well
with just tuning to the engine that you have using the hardware you have and a chip set to your BPW/BPC and fuel and spark tables
Byron
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