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Z51 is a 'package' that would include many options. In '90 it would have included FE7, J55 and KC4 I believe. You should show all of those and also an M6 transmission.
Off topic, but is there a VIN number stamped on the hood of a 1990 Corvette, or on other body panels? I seem to remember that cars from the 1980s had VIN tags on all their body panels to aid with theft recovery.