Stop in for a cup of coffee

why? There are other headers that work, Hell I have a set for the 440 in the dart!
That's probably an early A. I don't know of many chassis headers for those cars years ago. I think Dougs were available back in the day and then discontinued for decades. TTI hadn't happened yet. Were the Hookers larger tube?. Remember when Harold's Spitfires were all the rage? It would be fun to do a dyno test there. They were more of a tubular exhaust manifold than a equal tube length header.