66 Dart 270 Radiator Cap & hoses

Today I opened up my 66 Dart and did some work to her. I did a new air filter, fuel filter + hoses and I installed a new radiator cap. Can anyone tell me what this hose that runs off the port to the radiator cap connects to? And also is the cap neck supposed to be on an angle? Refer to pics

View attachment 1716103013

View attachment 1716103014

View attachment 1716103015

Overflow

To a catch can or earlier to the ground (not recommended)

The neck is bent. That's not normal