I'm not a huge fan of the 1227165 ECM. I would consider using one of the two computer upgrade options, links below:
http://www.dynamicefi.com/
http://pcmhacking.net/forums/viewtopic.php?f=7&t=375 (aka $12p)
Both computer upgrades use TunerPro based software, which is why I would consider these two if I had an engine like yours.
dave w
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