CPPA 440 A-body headers? Ever heard of them?

According to Roland, I purchased the eleventh set of 2" CPPA headers nearly twenty years ago. Still running them on my car. I had to make a new bell crank that is not the best design, but works. At the time, I was the first person he knew that was able to run a four speed with a mechanical linkage. I also had some trouble as I have fast ratio steering. I had to lift the engine slightly and dent the headers to get clearance. Spark plugs are real tight as well. I have wanted to replace them for many years as I believe CPPA later improved the design to fit a little better than the originals.
Rod