Over $6000 to install TTI headers on 66 Barracuda

The mechanic and I both missed the column shifter part. That was not noticed until the headers were in place. (Yes, I know I should have noticed that and the entire install was really an exercise in futility). I am not attempting to get out of paying him for his work; my problem is with the amount he is attempting to charge me
Sadly, I am not trolling.

Let the dumb comments begin

Is he frustrated or seems fed up with this project?

I wonder if the mechanic is pissed and just trying to get you to go away with that number or angry at the whole situation.