well the box should be close, heres whatcha do.
Park the truck, center the wheel. Disconect lines, column, draglink end, etc. The pitman arm should be pointin 90* to the box. Pull it off, then remove the 4 bolts holding the box to the frame, remove box.
Then hold up new box (or get someone to help u, its a heavy f'er), bolt it up. Then be sure the little slot (best description i can think) on the shaft on the box is pointing towards the frame, and the splines are to the side of the truck, and put the pitman arm back on. Now put the Ragjoint on the new box can only go 1 way ( I think, note this when u remove it from the old box).
Now bolt up the draglink, then bolt up the steering column. Refill the resevoir on the pump, jack the front wheels off the ground, start it,cycle wheels back & forth, refill resevoir, and so on till you get all the air bled out.
That should be all, hope you understand it all, if not, just ask again.
O yeh, dont hammer the pitman arm back on. You will damage the seals in the box. There is a little slot in the back of it, I hammered in a chisel (on the workbench) into this slot, spread it apart, then it slid right on the shaft.