The previous owner bought the car in 1977 when he was 16, he was told that it was a factory Super Stock car, but that didn't matter to him, he just wanted a '63 Plymouth post car! He bought a '69 383 4-spd drivetrain and installed it in the car. To fit the '69 bellhousing, these were the "mods" he needed to make in order to fit the parts in the wrong location.