Appliance industries headers
I had the exact same headers on a 73 Challenger 340. They fit well, didn't leak and were easy to install. As others have stated, they do hang low, and you have to be careful. I ripped the drivers side half way off the car one day, right after changing my oil at the DIY pit at a local gas station. Some kind of pipe or something was sticking up in the grass, and I hit it driving away when I was finished. Luckily, a friend of mine had the same headers that he had removed, hanging in the shed after he had put a 426 hemi in a Dart Sport. Of all the ground dragger headers I've ever had, the Appliance headers were the best.