While not precisely what you are looking for, I have a set of ARH long tubes 1 3/4 with 3 collectors and O/R X pipe. Can have it boxed and shipped to you by tomorrow. I have a sale ad with pictures in the classified section.
Those are overkill for an otherwise stock car and would kill his low end. I need them but I am only interested in kooks because they are the only equal length long tube made for 3v's and if you probe with a temp gun on each tube( which I have ) the kooks maintain a constant temp across each primary which helps control combustion temps. I'm running high boost so I pay attention to those details. If they were 1 5/8" I would sell theme to him. Those are still well built headers but not for me. Thanks