225 Slant Six Manifold

Dexcool and all the other ones that are not bright Prestone green are all Aluminum safe. You probably have no AL in the slant motor or cooling (maaaybe water pump? ) system so good'ol Prestone. Does it freeze in Georgia? The old Mopar anti-rust additive is probably all you need.
it does get below freezing a week or two out of the year, but only about to about 20 degrees or so. So just any prestone coolant should be good then? didnt know if there was some secret coolant out there. i'd read about evans waterless but the reviews on this website for it scared me off