The Jetfire Turbo-Supercharged V-8 was a very advanced and unique engine. It was aluminum, turbocharged, and it used methanol injection to preclude detonation. As such, it combined supercharging with ultra-high compression, something not tried again for over thirty years, and then only with the advent of engine computer controls. Regardless, it was successful.
As a result, the engine was quite a bit different in construction and equipment from the 2 and 4-barrel non-supercharged versions – and as such a separate manual was issued denoting the differences in assembly, tuning, and carburetion.