If the VIN stamped on the engine matches the vehicle VIN then it's probably a true SS. Engines have been restamped to make them look numbers matching. You'll find the block number and year of manufacture on the back of the block above the bell housing.
A true SS would have front power disk brakes. A larger fuel pump with a return line to the tank. It will also have a screw clamp rag joint fitting on the end of the steering shaft. A non big block would have a pressed on rag joint. A 12 bolt rear as well. None of these proves it's an SS but if they're lacking that's suspicious.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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