New fuel tank needed

Hello everyone,

Just found out today that my fuel tank is leaking, it has a tiny crack in it. Anyway was looking around for a replacement and found this one from Classic Industries: http://www.classicindustries.com/product/mopar/a-body-dart-1963-76/parts/ft6005a.html

It has a single vent line, that my car currently doesn't have, but was wondering if I can use that line for a return down the road. Also that tank says Zinc plated steel, is that OK?

Thanks for all the help.