Assuming you turn your high speed on fan, and assuming your new radiator is not clogged, and your thermo is opening properly, then I would first verify the actual tempature of the coolant before thinking it's hot via OBD2 scanner...If it is in fact running hot, then my second notion is to think a blocked coolant passage, either in the block or the hoses (if you have a blown head gasket I would put money on a block passage near where the head gasket is blown). Again, it is needs to be confirmed whether the head gasket is blown or not.
After all that, I'm kind of at a loss...if your coolant is circulatings properly, fan is colling the collant in the raditor, and the thermostat is opening allowing hot collant out and cold coolant in, then I'm not sure.
I did not see that you replaced your ECT sensors, may be a good idea to do that too (at the least the one near the passenger side head, since that is the one sending the ECT to the ECM).
I would recommend to you to make sure there is no air in the system but the 4.6Ls cooling system self-purges so...air "shouldn't" be in the system..key word"shouldn't"...
Matthew 26:52-54 / Go Pack Go!
1987 Mustang GT Hatchback - 2V Mod Swap In The Works
1997 Lincoln Town Car, PI Intake/Cams, Sofa-On-Wheels, "Fat Tony" we call it
2001 GT Convertible - D1SC / Geared / Cammed / 440wh 400wt - TOTALED 2/2019