Dougs headers or TTI step headers?

They may very well have sent you the B/E headers and not A body parts. We tried to put a set of B/E headers on an A body and I recall the issues being very close to what you have.

The A body headers have a tube that is flattened out on drivers side to clear the torsion bar, IIRC. Right where the one you have is beat to death. The B/E headers didn't have that flat spot from what I remember.