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To add to what Mike said, the alarm should use the same round head key that the spare tire lock and rear storage compartment lock use.
Turning the key in the alarm horizontally should arm it and opening either door or hood while armed should cause the little trumpet shaped horn located in the area under the antenna by the gas tank to beep.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.