Without documentation, such as build sheet, POP, etc. it's almost impossible to prove. You can look for the obvious signs. All 69 SS came with a 396, 12 bolt rear, not necessarily a posi. Front power disk brakes, either a Turbo 400 trans or a Muncie trans.
Post some pics, especially engine compartment.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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