Thoughts/do I need to dent my new headers, new pics ?

You’re obviously 100 % correct. The one thing I do find though is that the parts of the steering that are closest to the header like body of the tie Rod end and pitman where it connects to the centerlink on 73 and up is bigger and may provide less clearance than than the earlier style where just the stud and and castle nut are closest to the header? In fact on my picture I posted I have ground the threaded stud on the idler and one tire Rod end and it would just touch. You wouldn’t have this flexibility and also would not want to grind on the body of a tie Rod end or pitman. Just a thought.

It’s certainly possible.

But I think realistically the differences in clearance from one car to another, or even one brand of pitman and idler arm to another, are bigger factors. Even one set of headers to another, even of the same brand/model.

All I’m saying is that I wouldn’t switch from 73+ steering components to 68-72 steering components and expect that to solve the clearance issue by itself. Could it? Sure, in one instance it might. And in another it could make it worse, and I don’t think it’s clear cut the situations in which it would work or not.

I’d be far more inclined to adjust the headers.