fuel line question

The original line on my '67 is 5/16". If you're willing to use hose, all you need to buy is the barb (connector) that screws into the fuel pump for the correct diameter hose. Just take the old connector with you and tell the parts guy what diameter hose you will be using. With that being said, some fuel pumps don't have the barbs that will come on and off. If that is your case, there may be some sort of step-up barb available--one end 5/19, the other 3/8.