[montanafordman]

I had foaming issues with Prestone - but I have had good results with Oreilly branded conventional green antifreeze for older vehicles.

Don't over think this... Should there be some sort of anti-rust additive? Yes... I think everything mentioned already takes care of the corrosion prevention but antifreeze has that and will prevent the head or block from freeze cracks if your car will ever be in freezing temperatures.

I'm sure they used pond water and some bootleg moonshine back in the day and got around just fine.