BBMC is a E6 mask according to the BCC lockup spreadsheet I got from moates.net years ago. It is a 1993 calibration for a 5.7 using the 16168625 ECM. Given the changes you have made to your engine, I would start with a BJYL bin ($0D mask), then modify the timing tables for the vortec heads. Search the forum, there is a lot of good advice on what to change. Fast355 is being modest, he can help you dial in your rebuilt engine fairly quickly.
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