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I think you could order A/C with any engine that did not have solid lifters. (the problem was that the drive belt would fly off or snap at solid lifter red-line speeds)
a quick look at a corvette black book would also give you the info you seek. unfortunately, mine isn't with me in the office at the moment, sorry. i had a 63 way back then, but honestly don't remember to answer your question off the top of my head.