383 into /6 dart?

Hello guys and gals,
Right now I have a slant six in my 1973 dart swinger. I planned on keeping the /6 untill my friend let me knew his friend was selling a working 383 and tranny for $500.
I'm not sure if I will get the engine or the condition or anything about it(I have yet to find out)
But before I look into it I was wondering how much I would need to do to get the 383 into my car and working My questions are, what will I have to change to get the engine in and working,and any dificulties I would run into?

I know it is kind of vaque my question, but I basically wondering everything I need to do to get a 383 into my /6 dart.

-Thanks Mike