No, No way. I drove an old plymouth duster with a slant six back in the late seventies. My Challenger R/T is an original N-96 Shaker 4-speed car. It has been fully restored, it had the original engine, transmission, dana 60, hurst pistol grip 4-speed, ect.. Its a numbers matching car that had some durability enhancements done to the engine, tranny, suspension. The car looks stock but drives much faster and corners much better. All of the modifications were bolt on parts with the exception of the frame hung rear sway bar just like the 70 T/A trans Am challengers/cudas were built with. I kept all the original parts to the car and had them restored as well, hope this clears up the slant six confusion. Oh and the slant six still ran but the duster rusted away to nothing and I had to scrap the car, its been re-incarnated to a Daimler Chrysler subsidiary however, its called Mitsubishi Motors!