HEMI swap

I'm interested in doing the swap. My concerns are

1; What year HEMI is the easiest to swap in?
2; from a truck or car?
3; best place to look for it?
4; Do you need an after market wiring harness
5; I would like to use a tranny that come with the engine what years to avoid per wiring also?

Any help would be great! I plane on putting it in my 69 Dart.
1. 2004 & up (only need 1 computer for motor & trans )
2. dosent matter ( car is better looking IMO)
3. local bone yard, Ebay
4. It makes life a lot easier.
5. 2004 up truck trans (545rfe) can't do car trans yet.
good luck....