318/904 to 5.9L/4 speed

I'm planning on doing a 5.9L swap for my 74' Duster, and I'm wondering what needs to be done to the 5.9L in order to work with the 4 speed. What parts can swap from my 318 to a 5.9L?Oh and one more question: I planning on picking up a cast iron 4 speed, but am curious if its possible to buy a gear set from Brewer's and swap it for the overdrive set? Thanks