74 Dart 318 Hedman Headers

Okay I have a question. I know that this is done all the time so I know that this will be an easy thread. I have a 74 Dart Swinger that was a /6. Now has a 318 in it PS & 727. I have a set of Hedman Headers that I need to install. Who can tell me the easiest way to install them. I know that the center link has to be taken apart and fed through the header. But what is the easiest way to do the entire project?