Fuel lines for my 70 Dart 440 500+ HP??

so leave the stock pick up and run either 6an or 8an steel braided to the fuel pump? or must I use aluminum line?
Run a 6AN line, braided line (I used black braided fuel line, I don't need bling) to the fuel pump and then steel line the rest of the way. My setup is different because I'm in-tank on the pump so the filter is back by the tank. I run steel line (supply and return) to the regulator with flex to the injector rails.