Well, I don't know about the headers, but I recently put an electric fuel pump in my 68' Cougar. It's super easy if you have a day to spend on it... The things just bolt to the underside of the car wherever you want to bolt them, the only real tip that's all that important that I can think of is to put the fuel pump as close to the tank as possible. (electric pumps are better at pushing fuel through lines than pulling it). also it may help to use a fuel pressure regulator. I found that my pump was puttng out too much pressure and it was pushing up my carb floats . Use steel fuel line or braided line if you can, and plan it out so you have to use as little line as possible with as few bends as possible too. Hope this helps a bit.