MOTION MADNESS III hosts some of the finest documented examples of  dealer-marketed Chevrolet Supercars. Not the largest by sales volume, but certainly the most prolific of all niche-market Chevrolet super-performance builders-marketers of the 1960s-1970s, Baldwin-Motion was well represented at this year’s MCACN (Muscle Car and Corvette Nationals), showcasing a  dozen examples of Joel “Mr. Motion” Rosen’s prize offerings at MOTION MADNESS III.  Adam Tuckman's '70 Phase III ...