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The 236 and 096 don't show any Chevrolet production application - must be from other GM car lines or service replacements. You need an 043 dated up to six months prior to your car's final assembly date for full NCRS judging credit, although 2-6 weeks is more "typical".
Assuming you find one with the correct configuration, the Delco generator tags, correctly numbered and dated, are readily available from most of the vendors.
I found an excellent article in SACE magazine. The tac drive is 1102043. The fuel injected one is 1102173. Also beware that there are "Corvette" mounting brackets and passenger mounting brackets. These are the brackets that mount the generator to the exhaust manifold. Do you have access to a fax ?
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.