69 Dodge Dart Venting

Hello Everybody,
I have been reading various threads and have just managed to confuse myself regarding the sort of venting setup that my 69 Dodge Dart should have.
As per the attached picture there is a small tube that connects at the top of the filler tube inside the trunk. It loops around and exits the trunk by following the filler tube towards the fuel tank. The odd thing is that I assumed it would run back to the fuel tank. However from what I can see after lifting up the boot around the filler tube it seems to run straight down into the rear frame rail!!
I would like to know what the correct setup should be. The fuel cap is non venting as per the attached picture. Was this the correct factory setup or has someone made modifications in the past? The reason I ask is because we recently had a really really hot day and the car was parked in my drive. I came out and there was fuel flowing out of the fuel cap down the side of the car. Appreciate any advice you may have. Almost forgot she has the original 273.
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sounds correct to me. my 68 fastback was the same way. I got it out of the frame rail, and along side the frame w/ a rubber extension hose on it. also added an atmosphere vent to the system. still don't want over fill and park on a grade tho. (not that I`m driving it yet) .) these cars had problems like this when they were new!