Rusted Upper Control Arm Brackets - 68 Dart

If your planning on spending the money for a complete kit, you could always go with the Martz chassis which would replace your bad section of frame
check out the installation pics at the top right of their link , shows how much of the frame it would replace.It is very possible that your frame below the upper brackets is rotted on the inside.You could get a boroscope and see how bad things are on the inside.

http://www.martzchassis.net/chryslerabody