One of the other things that was mentioned When I was doing the same thing as you, is to contact PHS & see if the vin with the "7" is not only a legit vin, but a W72 4 speed car. If it comes back as a different engine, I would think you could be assured its a mis-stamp.
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68 GTO 4-spd Convertible
78 S/E Trans am L78, WS6 Auto
78 S/E Trans am W72, WS6 Auto
79 10th aniv W72 Trans am
80 Indy pace car Trans am
89 Trans am GTA
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