73 Dart 3rd member swap

I have an 8 3/4 from a 68 Cuda, that I am planning to swap into my 73 Dart. Before I screw this up, can you guys direct me? Please if you would tell me all the things that I need to do or have ready for this swap. This site is a wealth of info, and beleive me I appreciate hearing from you guys that have done it.
Beastidoggie