Green or Newer Coolant Type for Rebuild

Don't go by colors. Green colored coolant might not be the same between manufacturers. There organic and non organic types.
Are you using any aluminum components in the cooling system, like aluminum radiator or cylinder heads ?

Antifreeze - Ethylene Glycol vs. Propylene Glycol
https://www.autozone.com/diy/antifreeze-coolant/antifreeze-buying-guide