Before you go to the trouble of changing steering boxes, try adjusting it.
All you need to do is loosen the big lock nut on top of the box and then screw the set screw upwards to tighten up the steering.
Remember the screw must unscrew to tighten. Do it a half turn at a time and lock it down each time. Then take it around the block to test. If you tighten it too much, it won't return to center after you round a corner, so be careful!!!
Ben
www.reproduce100s.com