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Just about all components: Engine number, intake manifold number, carb number, distributor number, exhaust manifold number, transmission number, VIN number, numbers on all trim parts, numbers on dash clusters, steering wheels, etc. I think for the purpose of a number matching car, though, you want the engine, trans, intake setup, and maybe the rear diff to match the build sheet. All the other items need to be date coded to the build date of the vehicle. Original cars command big $$$ for a reason! guys like me bought GTO's in the '70's as used, $800 cars and beat the H-E- double hockysticks out of 'em. Parts got broken, "upgraded" (almost always a DOWNGRADE), and discarded. Numbers matching cars tend to be stock, automatic transmission cars that were purchased and owned by responsible adults (Like all of us are, NOW!). I've owned four GTO's with 4 speeds, and NONE of them had the original block. I've owned 5 automatic GTO's, and ALL of them had the original blocks. I've only blown one motor in 30 years of GTO operation (a 90 mph downshift into third gear with a 4 speed car). Matching numbers stick cars are a real treasure!
Jeff
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