the production information will be able to match up the dates and correct part numbers of all of your major components to prove teh car is original.
with older cars there is a portion of the vin stamped onto the block and trans along with all the casting and date codes on the parts to prove it is original.
later cars like your IROC would only be able to prove through a correct vin, rpo sheet, and matching(tiem frame, not the exact same date) production dates on the major components.
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