Tti

It is interesting how everyone is reporting different fit issues. That may be due to the model year of the car, specifically the steering center link and pitman arm, and the k-member.
Mine was a 1975 Dart sport with six cylinder k-member modified on left side for Schumacher conversion mounts, and if I recall correctly it had the steering center link that takes a pitman arm with the stud pointing down, same as the one in post 19 on AndyF's car. You can see the other style in the last picture of post 3 by Dragonsteel, where the pitman arm loops down under the center link and the stud faces up.

I ended up modifying one tube on driver side to clear the pitman arm. I cut it out and moved up one bend instead of dinging it. The pitman arm was contacting it, but not really bad.
Both before and after the header was modified I was able to remove and install them by disconnecting the engine mount from k-frame and then raising and tilting the engine toward right side. Left side header went in the from the bottom, but the starter has to go in and out with the header.

I think there was a change by TTI at some point, because I remember seeing a picture of AndyF's headers in his build thread and his right side was shaped a little different than my right side.