Hi, my understanding and experience is that the 4-bars and drag links should run parallel and be the same lenght to eliminate "bump-steer" which happens when the drivers side wheel hits a bump and goes upwards, if the drag link is too short it will "pull" as it runs through a different arc and will make the car dart to that side, same effect if the drag link goes up from the steering box to the steering arm on the back of the spindle or stub axle (I have seen lots of T-buckets like this), it also makes the car dart to the drivers side as the car goes over a bump. Hope this helps, Tom
p.s. with radius rods the same applies - you could try mounting the s'box forwards a bit and run a drag link to the opposite side stub axle behind the front axle, a "cross-steer" set-up. My cousin did this on his duece and it worked a treat.