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From my experiences with Vettes, only custom programs work. The stock programs from Hypertech and other companies are worthless except for the adjustments made to auto trans shift speeds and pressures.
I actually did my own adjustments, with help from an engine programmer, with a LS1 edit while doing dynos, but those can be very dangerous to the engine.

As you will notice, I say programs not chips. 1COOLH3 is corrrect, they are not replaceable chips, they are programs (calibrations) you download. I also agree with his statement, there is not much you can do with this engine. Not like a big V8.