Updated SPITFIRE HEADER INSTALL 63-66 A-body

What are the sizes of his tubes? Im either going to make my own or get his. I debated this for a while, but its not much less to get the mandrel bends and fab them up. If I make my own, they are going to be like Hussler fenderwells. only 2 bends per runner! And my inners are already hacked from an old set of 5208's.