67 barracuda heater core replacement

You may want to consider getting a gasket/rebuild kit from Detroit Muscle Technologies (DMT), If you are going to go as far as changing out the heater core, you might as well do the whole thing right and make sure everything is sealed.

In my Dart, when I changed out just the heater core, and did nothing else, It always leaks hot air. One of these days (when I finish my 67 Barrcuda), I am going to pull the box in the Dart again and do it right.