Young Gun's 72 Swinger

Okay so i was wondering, lately I've really been wanting to put in a four speed, what other transmissions can mate up to a 318? How much is the conversion by just gathering them all?
My current trans is going to need some seals and an aluminum pan so I was thinking just that money there and I could atlas have the transmission?
Saw an old magazine article where they took an od 833 out of a volare?
I've been going to school up here at McPherson, about to come home for break, and have really changed a lot of my plans to more where its exactly how I want it. Will get a cage in it with subframe connectors and hopefully adding some fiberglass bumpers!Feeling confident that the color is going to be a semi-flat gold!