tti header clearance problem

My header issue on my 68 Dart was on the passenger side. .. A nice shim fixed the issue. I presume over time the K frame tolerance is not perfect from factory. I guess the headers are designed from manufacturer specs thus a tired K frame might cause not a perfect alignment for the header tube...
Lots of torque from the motor over time sure aides the changes..

I used www.engine-swaps.com shim kits... it comes with a nice variety