I have the QA1 tubular K-frame and the Flaming River steering coupler. I'm hoping not to have some of the clearance issues I've heard about. TTI makes a great exhaust system I refuse to hammer them to make them fit.
Then headers may not have been a good choice for you. Some cars clear TTI’s without any dents, but many do not. Same for Doug’s, some have no clearance issues and others do. And some cars that clear Doug’s might not clear TTI’s and vice versa. Most instances can be fixed with a small dimple or two.
I wish you luck, but if I were 100% unwilling to even consider adding a small dimple to a set of A-body headers, I wouldn’t buy them. The factory tolerances on these cars are wider than the header clearance available on cars they do fit without any modifications. If you read between the lines, that means between factory tolerances and header production tolerances there are absolutely no guarantees they’ll clear without minor modifications. And you’re actually combining factory tolerances with several major aftermarket parts in addition to the headers, each of which have their own production tolerances.
I would wager there are far more A-bodies with TTI’s or Doug’s that have small dimples or minor mods than ones without. A quick search here will find you plenty of horror stories, a few success stories, and many that are somewhere in between.