[incoming]

What part of Texas are you? The winters are very different in Galveston than in North Texas.

I think you have a couple of things going on? Ethylene Glycol doesn't move heat as well as water. 50/50 isn't needed in my part of heaven. If your car is garaged, I would not protect it for anything less than needed.

I have a neighbor who has a 427SO who's had problems with overheating for decades. I inherited a dump truck with an FE that will sit in traffic hours.