Wondering what that line coming off the front of the carb that isnt covered or plugged is...and what i should do about it...

What the hell is this thing...ahah i know it attatches to the pcv valve but do i need it plugged and can i or should i just get a breather for the pcv valve...other options?

Should i get plug protecters...JCAT said something about them being too close to the headers...any sugestions...thanks for all the help guys...seriuosly really helps....lemme know