Well mainly it depends on what kind of transmission you want. The easyest swap would probably be the old 3 speed, but the gearing sucks on them. A 4 speed would probably cost the most and a T-5 would give you the best shifts and overdrive, but would be the most work to put in. I would say the hardest part of any of the swaps will be finding the clutch pedal, Z bar and linkages. For the T5 you will have to rig up a cable setup.
