CAN'T FIND 1970 DART 340 HEATER CORE AND EVAPORATOR

Your original can be pressure tested and resoldered if needed. They usually fail at a solder joint. I have looked all over for an E body heater core (w/AC) and can only find them at classic industries. I pressure tested mine to 40 psi and she is solid so im running it.
The non-AC ones are super easy to find.