Coolant overflow capacity?
Coolant recovery tanks didn't show up on Mopars till 71-72 Before that just a puke tube to the ground.
Some aftermarket tanks are about 2 quarts. Some are clear others are different colors that can be had from Summit/Jegs
You may be able to use a tank/bottle from a 73 up Dart or Duster.
In the photo is a black expansion tank from Summit. Lower right corner
Coolant recovery tanks didn't show up on Mopars till 71-72 Before that just a puke tube to the ground.
Some aftermarket tanks are about 2 quarts. Some are clear others are different colors that can be had from Summit/Jegs
You may be able to use a tank/bottle from a 73 up Dart or Duster.
In the photo is a black expansion tank from Summit. Lower right corner