fuel return and vent/vapor lines

I recently bought a 1971 Cuda with a 426 crate engine. With all great deals come some surprises. This cuda only has a fuel line and no return or vent lines, it has four nipples on the gas tank and two are plugged and two open. My garage completely smells like gas and although I am ok with it, my wife is not. I am looking to to close the loop and am looking for some help, guidance and suggestions. Any and all ideas, pictures, diagrams are more than welcome.

This is what i am working with,...

fuel return and vent/vapor lines