CPPA headers

I am not familiar with the pro parts headers. I've had these CPPA for some time(> 5 yrs) hanging on the wall. We had a 400/472 stroker in there with the stock cast iron exhaust manifolds. When that motor was on the stand the driver's side front tube(#1 cylinder) hit the Mopar black valve cover near the #5 cylinder and needed a 1/2" spacer between the tube and the flange. Frustrated, we pulled that motor and placed it in Dakota with hand fabricated headers that ran in high 9"s. Meanwhile the Barracuda has sat inside untill I finally got off my butt and we rebuilt/blueprinted original 383-4. Hope to have it up and running shortly.