Strange as it may seem, there are not a whole lot of steering boxes that lend themselves to hot rod steering, especially if you want the drag link parallel to the frame rail. Here are some choices:
Early Ford pickup, like '53-56 (maybe earlier too) This is the one I generally use as it almost bolts in place of something like a Model a box and gives very smooth steering. I have one in my '27 and one in my '39 Dodge.
Later Ford car, '39-48. You can turn it on its side and make a mount to put it so the arm goes up and the draglink runs parallel to the frame. I have seen some lately where they put the spined shaft under the rail and point the arm up.
Corvair and Flaming River corvair type box. In reversed form these make pretty good steering boxes, especially the cast iron ones which are stronger. I have one of the Flaming River ones in my T and like it a lot.
Vega and 525 Saginaw box. Generally used up front with the draglink running to the right side wheel, 90 degrees to the frame rails.
BMW model 2002, about 1975 on I think. Great for underdash cowl steering applications. You want the non power model, and the arm points down when in place outside the cowl.
There are others, like the early VW Bus, early Dodge Vans, etc. Some people have even used combine steering boxes from farm equipment. I'm sure there are tons more, but that is all I know about.
Don
