Getting rid of oil bath air cleaner

[barmanvarn]

Working to revive my Dad's '69 GMC C15.

At some point, he went to a modern filter. When he did this, he simply cut the line coming out of the valve cover and plugged the remaining 3" of line.

He and I have a different approach to these sorts of things. Personally, having a 3", plugged hose coming out the side of the valve cover is driving me nuts.

What is he best way to remove this hose for a cleaner look? Is there something I can use to plug the hole in the valve cover? I'm assuming I can buy a new valve cover that doesn't have this hold but don't want to spend that money just yet.

thanks