That brings back memories. The first set of headers I ever put on were Caslers (IIRC) on my 340 4-spd Dart. That project used up three days of my first vacation from work. I was a full bore neophyte on this car stuff, and had minimal tools. Despite missing several bolts, those suckers never leaked. When I built the motor a couple years later, a set of Hookers went on. With every bolt. And they leaked brutally. The only way I was able to eliminate the racket from leaky flanges was to turn it into a full-time bracket car with open exhaust. My current heap has Doug Thorley's on it.