Curious what's out there for a header for my 440 dart sport

After all this time and wasted effort yes you're right. Those headers do not fit and I'm living proof that my best effort to not pay 1K for headers. Well I just bought a set of TTI RB 440 headers and man wish I listened to you months ago.
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