3 on the tree to a 4 speed, what do I need?

Awesome, thanks for the replies. It's a 68 Barracuda by the way. What year(s) 4 speeds will bolt up easiest? Having OD would be nice on gas but it's not going to be my daily driver so it really doesn't matter. I guess I'm just looking for the easiest swap since it's my first time doing anything like this.