I use the measured flow only as a best guess what to program the PROM with. What the PCM "thinks" is the injector flow is, and what the measured injectors flow is are apples and oranges! :doh:
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I've looked at the .bin file that was downloaded. I think maybe to much advance in the near idle table. The reason I say this is because I just finished tuning a 383 with 9.8:1 / Single 670 CFM...

An excellent picture of a TBI running WAYYYYYYYY to RICH.

dave w

The '7427 has two VE tables and two SA tables. Maybe for the time being it might be a good idea to set both tables to the same value? I think I would try using one IAC, and leave the other IAC...