changeing my transmission

on my 78 bronco with a 302 and 4 speed manual with 4x4.. I want to pull out the 4speed and replace it with a c6 .. is there a c6 that is the correct length where i dont have to mess with drive shafts???

There are two 4x4 c6 lengths and to the best of my knowledge both are longer than the 4-speeds so driveshafts will most likely need changed