My $0.02 on this topic...
I've got fully commented source code for the 91 BFXB, and most of one done for 93 BMCB, as well as the calibration information for all the other years. It was excruciatingly time consuming, but five years ago, I had plenty of time.
Aside from the 'neat factor' of having the data, I can honestly say it was not time well spent. After trying all sorts of code modifications you can imagine (closed loop lambda control, 2-stage rev limit, custom data streams, etc. etc.), I have come to the conclusion that the factory calibrations are pretty damn good. Thus, on the 427, I'll be using the BMCB calibration with just a few basic modifications.
We'll have to see how it runs, and I do get the wild ideas to do other novel stuff, but nowhere near the time to do it. At the end of the day, the factory calibrations are more than tuneable enough. Assuming you have access to all the tables and variables. That part is useful, because the commercial tuning software just show a fraction of the variables.
Happy to help anybody who's heading down this road. Been there, done that.
Todd