72 Demon 340 fuel system

I have a 72 340 Demon what size fuel lines would it have from the factory ?, 3/8 or 5/16 . Im looking to buy a 521Restoration fuel tank soon.

5/16 Is this going to be a restored car? If not you might consider going 3/8 if a hotter engine or stroker is in your future.

5/16" is stock. You can go bigger, but will need to upgrade the clips etc to the larger line size.

5/16" is fine for most cars, and unless your racing it you really don't need to go larger.

Thank you for clearing that up for me 5/16 lines it is.