Fuel Line for 1970 Duster 340

I purchased a 1970 Duster 340 4 speed and the fuel lines have been messed with. So I was needing to know what size the fuel lines came on the car from the factory, since I'm putting it back to factory specs. Was it the 5/16 or 3/8 from the fuel tank? I plan on doing a factory restoration and have it more as a cruiser. Please bestow all of your wisdom upon me. Thanks Tom
Fuel line was 3/8 from the tank to the carb.