For those of us that are having radiator issues, putting in a bigger engine, or just want a bigger radiator and you don't mind using an aftermarket part, here is a writeup for Griffin universal radiators. Now in my situation, I used a Griffin model 1-272DF-AXX. It is a universal aftermarket meant primarily for rat rods but it fits the bill.
http://www.griffinrad.com/load_details12.php?PartID=759&key_id=1-272DF-AXX&year=All&make=Universal%20Fit&model=Rat%20Rod%20Radiator
Now the problem with this particular model is it is WAY TOO TALL. THE COMPANY'S DIMENSIONS SHOW IT AS SMALLER THAN IT IS.
To use this one I had to make some modifications to pretty much everything, including modifying the bracket on the front for the fenders.
JUST GET A SHORTER MODEL, IT WILL SAVE YOU SO MANY HEADACHES!
Here is a nice page of options!
http://www.griffinrad.com/RatRods/index.php?tid=14
Now, The list of things to do:
Originally this radiator comes with the filler in the center, it must be moved to one side or the other, or just deal with it. I had it moved.
You need to fab up and weld some aluminum brackets. not the worst thing to do if you have the resources.
The top hose is different size and different place, you need a new thermostat housing. It is a factory part from NAPA
The lower radiator hose is a larger size. It can be adapted any way you like, I machined an aluminum adapter.
Now this is a lot of work, but when you are done that truck should never overheat again!