This 1970 Challenger was shipped from the assembly line to Chrysler's Product Planning Garage with Car Order form instructions that the vehicle was 'to be used as a basis for building the Dept. 1277 automatic transmission test and development car - Ted Spehar.' From there it was shipped to Spehar Performance in Royal Oak, Michigan. Billed to the Drag Programs and Drag Liaison office at Chrysler, it was ordered to be developed into a Pro Stock drag car assigned to Spehar Performance, a competition firm owned by Chrysler. As a 'body in white', it was extensively modified after the body was acid dipped to reduce weight. A roll cage was installed for increased rigidity, a 426 Hemi engine fitted with dual 4-barrel carburetors on a tunnel ram intake, dual plug aluminum heads and dual ignition, and an auto-shifter added.
Don Carlton of North Carolina, late of the Sox & Martin team, did most of the driving. Comparing Sox's similarly prepared 'Cuda, Carlton set records as the quickest Pro Stocker in the country during 1971, with an all-time low ET of 9.48 at 148.10 mph at the NHRA Grand Nationals in 1971. The best ET for the Sox & Martin team that year was 9.58 seconds, leading to protest. Tear-down proved the Motown Missile was indeed legal. Two engineers were assigned to the project and over $100,000 was spent before the car was sold for $20,000 to a Tennessee buyer, still showing its 1971 Gatornationals qualified sticker.