About the only thing you could swap is the motor and tranny. If I were you I would pull both the motor and tranny then send the car to the yard. The engine is not necessarily a high performance motor however it should be a roller block and have efi. The tranny I would have fixed and install in the stang since it is an AOD. The overdrive will allow you to run a lower (numerically higher) rear end. The low gears will make stoplight to stoplight really fun while you will still be able to drive on the highway without the high RPM's.