I installed a 5.7 in to an old carburated Jaguar XJ6, it has dual tanks so a conventional set up with a return line doesn't work. So, I left the stock electric small pressure pumps in to the stock tanks and installed an auxilar 1 quart auxiliar tank in to the engine bay. After that is an MSD EFI pump, Aeromotive regulator with a return line to the auxiliar tank. Seems to work just fine the little I have driven it so far.