Actually I am in the process of doing the exact same thing. Here is a
link to where my thread is on the charger forum. It will be the same basic concept. I have a 73 charger.
So far i know this
I <donno if it will be the same for you, but probably VERY close> need to:
make sure i have the 8 3/4 inch rear end or better
bigger than 9" drum brakes in the back and the disks in the front are good enough
New mounts
New wiring harness
Typical Engine rebuild parts
Oh and your small block tranny wont bolt to the 440 I do not believe. And im also pretty sure that since the 440 is externally balanced and the 318 internally something needs done with that, but im not sure right off hand.
If you have found any other information about the swap I would love to know about it, like I said I am doing it as well.