Absolutely did not dent or ping anything. I would refuse to dent coated headers that cost close to $1000.00. I would send them back 1st.
To me, they are the best choice out there. You just need to take your time with fitment. If they hit something, then the engine is not correct in placement, even though they give you the spec's where they want the motor to sit, you may need to tweak it a bit. remember, your working on a 40+ year old car, so who knows if it has been wrecked or not.