[XfireZ51]

People hack GM ECMs frequently. Some replace code with their own for functionality they are interested in. JEP has disassembled the code from a 91.
The LT-5 code is based on the L-98 $8D Mask ID which is why the 90 Mask ID is an $8E. It explains why we have secondary injector relays and an Ignition Module that acts as a co-ECM controlling the dwell and overall ignition other than timing.
You can go to tunerpro.net and get the bin editor, download a definition file for the LT-5 along w a stock bin file and have a look. Just make sure the mask and bin file match up and are for the same model year.

Todd, you were also someone I was thinking of when writing the above. I agree that there is little need to modify the code if your dealing w basic modifications. Forced induction and things like NOS control is a different story.