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what would I look for to prove its a real, factory 427 Chevelle, besides engine VIN stamping?
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As Bruce says, there was no such animal from the factory. Dealer conversions most likely would not have the corresponding VIN stamp on the block. And unless you are an expert at examining such nuances as broach marks and metal stamp fonts, don't look at the engine VIN stamp as proof positive of a car's pedigree
