Your dealer didn't choke off any programming. They don't do that, nor do dealers have the capability.
Nobody with a 94 L27 has ever had a custom chip burned, and every car varies. Frankly, doing a Performance chip with minimal or no mods isn't going to get you much out of an L27. The chip should come later after other power-adding mods. Besides, without a dyno pull or 2 including wideband O2 readings, you have no idea how to adjust the fueling maps for the new shift points. This is the problem with 'custom' chips. Performance PCM'* for other applications are based on dyno/O2 work, and multiple cars to find a good common set of parameters.
You have the unfortunate luck to have:
94/95 Hybrid PCM
L27 (most people provide chips for the supercharged engines)
An older car, so that some chips that were available at one time are no longer sold
I would suggest sticking with the stock programming until you do something to the car like a cam, rockers, or other power-adder. You're just not going to get more than 5-10 horsepower out of a chip at this point, and that'* assuming you hit all your numbers correctly. Most custom PCM'* take several attempts to get it dialed in. At the very least, you need a scantool, and SHOULD have dyno time and a wideband O2.
What invite, and who'* curvy alice?