I run the TTI on my 63 with a 440/493 and I love the TTI's. Great fit and a top notch header. On my sons Dart which is a bigblock 400 B eng we use the CPPA which look just like my TTI's. These CPPA headers have been on his Dart since 1997 and still looking good. They have some surface rust but not much as they were not coated. We bought them just as they come which is a nickle steel I believe. They fit his bigblock Dart fine and as said have held up fine so far for 22 years on the car. Are TTI better then Doug ?? I have no idea as I never ran Dougs but from what I see and hear they are about the same in quality and fit so it sounds like you cant go wrong with either. I would go for what I can get at the best price. Good luck , Ron