1966 Valiant Power to Manual Steering Questions??

Hey everyone, needing your expertise here.
I plan on rebuilding the front suspension in my 66 Valiant here in the next couple weeks...hopefully. I'm sure I've got an upper control arm bushing gone on my driver side and the pitman arm is really loose where the center link mounts.
My car has a power box on it now but I have a manual box off of a 64 Dart 170 that I'd like to put on while I do the rebuild.
The manual box will interchange right??
What about the pitman arm, when I order my kit will I have to tell them to send me one for the manual box?
Also, knowing that the manual box is shorter, I'm gonna have to get an adapter to reach it right or can I modify my current shaft?
Any help will be greatly appreciated!!!