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I DON'T BELIEVE THERE IS ANY ONE THING THAT WILL VALIDATE A MOTION BEING AUTHENTIC EXCEPT RUNNING THE NUMBERS BY JOEL ROSEN (NOT A CHEAP INVESTMENT BUT WORTH IT IF YOU THINK IT IS ORIGINAL). HOWEVER, YOU COULD LOOK FOR CERTAIN OPTIONS THAT MOTION PUT ON THEIR CARS AND THAT WOULD INCLUDE MALLORY
CAPACITIVE IGNITION, HON-O-DRIVE, 3BBL HOLLEY CARB WITH GEAR DRIVE INJECTOR MATED TO A SPECIAL EDELBROCK MANIFOLD, KUSTOM HEADERS WITH CORVETTE SIDE PIPES, DUAL ELECTRIC FUEL PUMPS IN THE TRUNK AND MOTION DECALS ON THE WINDOWS, FENDERWALLS AND SHOCKS TO NAME A FEW PLACES. HOPE THIS HELPS YOU OUT.