good luck, purge the tubes, I used stainless so purging was a must but I also do it on mild steel just for a nicer finished product. I had $1500 into materials in the headers pictured above.
I have built a few set's. I have come to the conclusion that if someone makes them already, just buy them, I built my last set for my r5p7 motor in my dart, what a nightmare, but no one makes them so I had no choice