Header is rubbing frame - 70 Duster

Ever since day one of my 340 installation into a 1970 Duster, the left (drivers) header is making contact with the frame. They are TTI headers and fit excellent everywhere else. I have no other clearance issues or contact points. I tried to shim the engine at the motor mounts, but no change. I tried to heat the header tube and pry it away from the frame but that was a hopeless task.

The only thing I can see is the car has had some damage before I owned it on the right hand front. The small piece of frame that extends on the right side is kinked and bent inward. That is the opposite side of the problem, but the impact that caused that damage may have pushed the k-frame or bent it.

I am not sure what the heck is the cause, but has anyone had this problem, or what would you do to correct it. The car drives straight as an arrow and everything else lines up ok.

Are there some measurements I can take to see if the k-frame bent with the motor in?