I am currently building two cars, a 66 Chevelle and a 69 Camaro. Both will be powered by 230's. The Chevelle is on the road and will be primarily for the street; the Camaro will be for NHRA stock class drag racing. I've been looking for headers for a while now. Someone suggested I build my own - I'm going to give it a try. I bought a set of flanges from our own Twisted Six, I got them several months ago. Recently there is someone listing header flanges on Ebay; I bought a set of those also. I like the ones I got from Twisted Six much better than the Ebay ones. The finish is better, the outline is better, and they have a divider in the siamese ports.