I see no way those will work in an A body. I hope I am wrong.
I am right. Those are only for the B and E body. They will not fit your Dart.
Here is the detail page from Hedman. Scroll to the bottom where it says "VEHICLE APPLICATIONS" and you will see all they fit are B and E bodies. They are not an A body header.
Engine Performance & Vehicle Customizing Products From Hedman | Hedman Performance Group
