wild Willys, had a engine in the trunk just to run the 6-71, and pulled a 11.43 seconds and 120 mph at San Fernando

Don Clarkson's unique solution for the power robbing supercharger was a 331up front, and a tiny Johnson oil-burner in back. 

Described in the Feb. '59 HRM only as a "war-surplus" four-banger, the two-stroke devoted all 60 of its horses to driving a trunk-mounted GMC 6-71 supercharger. 

 Another, unsaid benefit was relocating the supercharger's weight rearward, enhancing what little bite was available from skinny, recapped slicks 

https://www.hotrod.com/features/hrxp-1105-1959-worlds-weirdest-willys-coupes