is this the line I need?

[realn96]

First off happy forth everyone!
  Putting all the brake and fuel lines in my 71 340 cuda yesterday , and being all the lines where missing when I bought the car. I ordered all the lines except the vapor return".didnt know I needed it" I believe its called?? Is that the line that runs from the emission tube in the truhk all the way up to the breather cap? From what I read its  a 2 pieces line and its 5/16 size? Just want to make sure I order the correct  line guys . Also now that I think about it I installed a new brake metering and proportion valve. I see that after installing all the brake lines to it, there is one hole that a line doent get hooked up too. Looks like from searching the web like there should be a "cap" or plug that just blocks off that hole? Is That correct?? I added a picture of the plug. circled in  red!

[anlauto]

Yes and yes

[realn96]

 
Can always count on your help Alan. Thanks a lot!!