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

I have not heard of this company before but I found some brand new headers in the trunk of the Dart I picked up. The instructions say they are for a 440 and will fit an A-body. I guess it's a pretty good score since they came with the car. The car also came with 440 conversion mounts from the same company.

Has anyone ever used these headers before onan A-body? What is the scoop on CPPA? I got a box full of old Chrysler Power magazines too. Good info. to see how things have not changed all that much in 15 years except $$$.

Thanks.
Dave