New and need a little help with a swap

Pretty new here and I've spent the last few days just browsing and searching around. I'm sure the answers I need can be found, but I'm just having a hard time piecing it together.

Now that's out of the way. I am looking at purchasing a 74 duster that was originally equipped with a /6. The car currently has no motor or transmission.

Can anyone give me a break down of exactly what all I'll need to put a 318 in, preferably an auto. Are headers necesary for this swap, I want to get them eventually but I would like to get the car on the road asap.

Thanks for any help.