[ECMnut at aol.com]

> There are other running the 4bbl unit wired like mine, and it works perfect,
>  but they are n/a.

Get their BIN for starters (assuming same holley unit & ecm)
  
>  i'm not trying to ask a specific question, more generally, how do you
>  account for boost on ANY engine?

Other GMs use a 2 bar map sensor instead of your 1 bar sensor.
Doing this usually means less precise MAP resolution, but
it gives you the ability to cover a range that's twice as wide (to +15psi)
Among other chages, they use the same 0-5 volt signal coming
from the sensor, and assume anything in the "upper half" of the
sensor's range is a "boost condition"...
Below is a base pulse table from a stock syclone..  Assume
that positions to the right of 50% MAP are boost conditions. HTH
(Table dumped using Richard Tomlinson's PromGrammer)
MV

0x0422  F29_TABLE   Base Pulse VE vs RPM And MAP
%        |  20    30    40    50    60    70    80    90    100%
rpm ---------------------------------------------------------------
800     |  34.8  35.9  35.9  35.9  36.7  36.7  36.7  37.9  38.7
1200    |  34.8  35.9  35.9  37.9  38.7  38.7  38.7  39.8  39.8
1600    |  34.8  36.7  37.9  37.9  39.8  40.6  40.6  41.8  43.0
2000    |  35.9  37.9  38.7  38.7  40.6  43.0  43.8  44.9  45.7
2400    |  36.7  38.7  39.8  40.6  43.0  43.8  45.7  46.9  47.7
2800    |  37.9  39.8  41.8  43.0  44.9  45.7  47.7  48.8  50.0
3200    |  39.8  41.8  43.8  43.8  45.7  47.7  50.0  50.8  52.0
3600    |  41.8  43.0  43.8  43.8  46.9  48.8  50.0  52.0  52.7
4000    |  43.8  43.8  44.9  44.9  47.7  50.0  52.0  52.7  54.7
  

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