Suggestions on venting fuel tank

Murray said

If your gas tank only has one vent fitting- I believe you have the wrong tank, at least not the original. Since you are removing most of the smog crap you now have the correct tank. I would vent it as original. going up the filler to form a loop, and then down the filler to under the car so you don't smell the fumes.

Click to expand...

I recently replaced the tank, but it is a match to the one that was on the car when I bought it. It looks like it was the original tank but I could be wrong. It has the same single vent at the top the ran a small rubber line to a hard line that ran to the front and went to the charcoal canister and to the old carb.

What was "original" what would I need to add or change?

Thanks