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Without the factory motor/trans its not a Z28 - just another modified 68 Camaro.
A car is only worth what a potential buyer will pay you on any given day.
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I beg to differ, a Z28 is still a Z28, even if it doesnt have the original engine, as it was a specific Camaro model, not just an engine/trans option. Not worth nearly as much, but you can't say its no longer a Z28 simply because the driveline is no longer original. While i won't make any guesses on its value without so much as a photo to go on, you can;t say its not a Z.