Replacing Fuel Line

While my car is apart I have thought about replacing the fuel line. Also removing the vent or return line that is capped off. Not sure which one it is. Its on the passenger side inner fender.

Anyways its not being used so its coming out. So Im only using the one fuel line. I have thought about buying a bulk roll of Stainless from Summit but that stuff is so hard to bend. Is there anywhere else to buy bulk line from? Is the Stainless line worth it? Also I see 2 different size lines 5/16 and 3/8. The car is a 71 Scamp. I assume its only the 5/16 but does anyone know for sure?

The other problem is, how do you flare the end (factory style) so you dont have to have 2 hose clamps