84 thru 89 (TTA) calpaks are all identical. The chip is basically a resistor network that delivers base settings to the analog section of the ECM in the event that the PROM fails and can't be read.
The resistor network values are determined based on the stock parameters, particularly stock 28.5 lb. injectors and stock fuel pressure. Once you upgrade injectors, the "limp-mode" condition will cause incorrect default fuel delivery, resulting in a potential cylinder wash-down (bad) condition. You'll run too rich, or not at all, and have the tendency to fill your crankase with unburned fuel and lack of oil will cause rings to score pistons - quickly.
For any of you hackers out there, I had decoded the calpak chip down to resistor values, and if you're resourceful, you could probably change a resistance value or two to make your own calpak chip, set up for your particular injector size. You gotta be resourceful though; figure out which resistance value controls the limp mode fuel parameters. I never did take it that far, although trial-and-error will get you there.
Anyone willing to take the bait?
