The rules state that a carb car can change jets to facilitate tuning. I take this to mean that I can change jets when necessary to maintain a consistent air to fuel ratio. Before a dyno? I don't have that answer.
7.21.1 The jets, metering rods, needles, etc in the stock / spec carburetor may be changed to facilitate
tuning.
I typically only change jets for altitude changes. With a single jet size I see 12 -13 A/F from Dallas to NOLA. But Hallett and Colorado are very different jet sizes to maintain that A/F ratio.
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