That's a Baldwin sticker on the back of this '73 - isn't it?
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From the Baldwin Motion site -
"Starting in 1967 and running through 1974, Baldwin-Motion offered SS (425-hp) and Phase III (500-hp and up) big-block Camaros, Novas, Chevelles, Corvettes and Biscayne Street Racer Specials. Cars were sold at Baldwin Chevrolet or Motion Performance, converted by Motion and financed and delivered by Baldwin. Phase III 427 and 454 cars came with a written, money back, quarter-mile performance guaranty from Joel Rosen."