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You might want to include some basic location information in your profile to avoid any confusion in the future.

If you are going to use your original gearbox, then use your original flywheel. The original 120Y gearbox was not used behind the larger engines but will fit & work well behind one anyway as long as you don't abuse it. Treat it with respect & it will last for many years, but if you practice your burnout technique with it, the service life will be less.