Green or Newer Coolant Type for Rebuild

IF you are using no copper or soldered compomnents (heater and radiator mostly)
AND
set up an overflow and recovery system that keeps the air out,
an OAT or H-OAT could last longer before it needs to be changed out.

Otherwise stick with a conventional IAT antifreeze.
https://www.forabodiesonly.com/mopar/threads/water…-distilled-purified-hose.543213/post-1974344733