These two images show one of the most important cars of the early Pro Stock era—Bill Bagshaw’s ’71 Challenger. Bill had rented shop space in an industrial park, which was coincidentally also occupied by a former Shelby American employee from New Zealand named Ron Butler, who knew nothing about drag racing but knew a lot about race cars. The technology Butler created allowed Bagshaw to move the ball forward in the sport, and this was one of the first Pro Stock cars to ever wheelstand. It was awarded Best Engineered when it debuted at the 1970 U.S. Nationals, five months before these pictures were taken at Pomona in 1971. Butler would be a major player as a chassis builder for much of the 1970s.