440 into a /6 duster

I planned that this isn't gonna be a bolt in plug and play project. When I first bought this car in highschool I put in a bigger diff with the bigger bolt pattern and I have the bigger bolt pattern up fronot with disc brakes. I'm thinking I'm gonna search for a 727 auto. I just wanted to get some opinions from what other a body 440s builds have to suggest. I really appreciate all your guys opinions.