[ghettoluxury]

I personally would try to stick to something that bolts to the outside of the frame, just to keep as much engine space as possible. The radiator on these makes space up front very tight so using the traditional Saganaw box is not really a good option. This is going to mean that you are going to have to cut a section out of you inner fender for the box to sit in place and the steering shaft to pass through. Your next hurdle is going to be placement once the axle is in place and you know what plane you are working on.

I would probably start with a box from a 73-87 Chevy truck (this is assuming you are using a small block engine) then go from there. I can already see that the factory shock location is going to have to go. From this point (if the box was too big or there were other complications like leaf spring interference) I would look at some of the Toyota stuff. The truck boxs have the pitman arm facing to the rear of the truck and the FJ80 has it facing the front of the truck.