Hi,
Another thought about the radiator. My buddy recommends running a coolant filter - and I installed one on my new 97 Bounder. It also has the 460" engine. I put one on my 75 pickup with the 460 too. After 1 year, it had collected a lot of sand looking stuff, and I have changed it yearly on my motorhome. I did not drain the radiator or change the fluid, until at year 10, when I replaced all the larger diameter hoses, but not the heater hoses (still original) and replaced the fluid then.
THe coolant filter is Napa # FIL 4070 while the holder is #FIL 4019.
My guess is that Ford installed a slightly larger than required radiator, to reduce warranty problems? Also after the radiators are 10 years old, they can have a lot of fowling, or dirt inside that prevents heat transfer. I am glad that mine is clean as a whistle! I agree, I never overheat, have the Banks system, and that oil cooler is a HUGE help to keep the engine cooler. My guess is that the cool oil takes away about 20% of all the engine heat. . .
My buddy's Mitsubishi Montero used to overheat, but he installed a industrial sized oil to air cooler in front of his radiator, and now it runs very cool. The cooler is about 18" tall,4 pass with 3/4" tubing. I think it belonged to a large hydraulic crane type of cooler. ..
Have fun putting it all back together!
Fred.