Nice try. How many of them have been modified whether it be a cam swap or full out stroker? In '96 there was a TSB on all GT's. Guess what was happening straight from Ford? They were overheating. The partial fix; a '97 GT condenser which is a modern design which flows better.
Also; modern E10 fuels raise engine operating temperatures. This is a known fact.
I worked at a high end hotel in Scottsdale in the late 80's to early 90's. Ford, Volvo and GM engineers all stayed there while using vehicle testing grounds throughout the area. I remember just as clear as day; the Fox Mustangs puking coolant in the parking lot of the hotel. The engineers had a semi trailer of parts and were racing to fix the issue along with attempts to swap the AC systems to newer refridgerants. All this before the introduction of oxygenated fuels.
I'll give you another example. My friend has a 1970 Shelby 500 with a 428 Cobra Jet. He has owned the car since '71. It has a period correct restoration and a deluxe Marti Report. He has to retard the timing and keep driving distances to a minimum or the engine will puke coolant. This started with the introduction of ethanol blends. It's no secret here in AZ.
Another example.... Ford sold 60's F100's with a 4 blade mechanical fan. If you lived out west; you often got a Modine Desert Cooler 4 row radiator. If you opted for A/C; your truck received a 5 blade mechanical fan. I challenge you to keep any of these old truck restoration's cool in our summer heat nowadays. We are talking classic trucks and cars with factory equipment.
Just one example:
http://b3cfuel.com/PDF/the_unsung_villian_update.pdf
There's a reason Ron Davis is so popular here.