Yeah, I think that's about right, longer pitman, shorter steering arm. The wrench was only on there as a way of moving things around.
But also remember that on a sprint car you are sawing the wheel about 3/4 turn, lock to lock. I've never driven one but would you even notice if it bump steered?
My permanent steering arm with be made of 1/2" steel rod and be mounted in all 4 holes on the spindle because the econoline spindle holes are just 2 1/2" on center and it's a little tweaky mounted in just 2. I will have the 1/2 inch rod turned down to 7/17 to fit the holes and thread it for nuts. I just don't want to build it until I am sure on the length and rise.