[406 Q-ship]

Fuel lines will have to upgated to fuel injection hoses. the ends of the hard lines will require a better barb and double clamp the hose on to it. I would use a frame mounted fuel pump like a that is internally regulated to 50 psi then let the fuel rail mounted regulator break that to 40-45 psi. A return line will need to added to truck, some 1970 and later will have a 1/4" line that can be used. The return line into the tank should be down into the bottom of the tank and pointed away from the fuel tank pick up. You could just run teflon braided -6 in place of the steel fuel line.