You have a lot of good suggestions here. I agree with as stated above. You have to find out the source of the overheating. You have to know the underlying problem. If your radiator is old I would start by having a respected radiator shop look it over and clean it or if you want a new one I would check out ACP and griffin radiators. As far as fans I’d stay mechanical but you could consider one with more blades and check your shroud. I’d also check the water pump and if you need a new one I would stay mechanical there too. When it comes to antifreeze it is added to prevent freezing and I believe it has some other beneficial properties but I don’t think it cools better than water. If it did people would run 100% antifreeze and no water.
67 Fastback S Code, Brittany Blue
Work in progress