1981 Corvette fuel tank vent question

I'm replacing my fuel sending unit on my 1981 Base model Corvette and after removing the original tank I decide to replace it also. I bought a Dorman 575-080 tank and it does have a vent line fitting at the top, the new tank came with a screw in removable plug for that line. I'm wondering if I should hook the original vent line back up or not. I've read that I can leave the vent line plugged on the tank if I use a vented gas cap. The problem I'm having doing this is what to do with and how to secure the the original vent line under the 1/4 panel to keep it from fluttering around. I'd also like to know if anyone has done this and had any problems after it's been done that way.

@Adams' Apple I feel like you might know the answer to this one