hey I have those on my dart! good luck hahaha they are a ***** to put on they hit in all kinds of places with my 1974 swinger 360 power steering they also make a noise from hitting the body and random other places on the car we had to work them out on the steering linkage and torsion bar on passanger side HAMMER!
here is those headers on my swinger open with the old 318
1974 sublime dart swinger - YouTube