Hmm. Some of the pics don't look too bad, but images 3 and 4 really tell the tale.
Although it might never be a problem, I wouldn't like the looks of that either.
I don't have an answer for you either, but can check tomorrow at work to see if it's something anyone has run across before. It could be something with the radiator of course, but with these rigs it could also be a slight variation in how your mounts were put on at the factory, or the body being just slightly shifted on the frame, or some other tweakage from old age and hard use.
But we can't rule out a bum radiator or something like that yet either.
Not sure what can be done at this point, but I'll sure put it out there first thing in the morning.
Sorry about the delay in your progress. Looking good. Looks like an Explorer serp setup. New engine too?
Paul