Personally, I don't run either water or anti-freeze. I run
Evans Cooling products exclusively. I ran into this company a few years ago and can tell you that their stuff really works. My cousin runs a 650hp SB Chev powered SS Impala on the streets of Los Angeles when it gets to triple digits every year with zero problems. I have ran it in my Model A as well with zero issues as well.
It is not cheap, but nothing worth while ever is.