Do I have to seal the tube up with anything or just leave it dangling there?

You're going to be replacing it (and the little valve cover elbow it feeds into) with a small breather..... looks like a small round air filter.

Ok I understand now, I was thinking the breather was some kind of adapter so the 14x3 would fit on the TB. I didn't realize the S bolt was all that was needed to adapt it. Thank you all for clearing that up, I plan on seeing what O'Reilys has today, unless y'all think I would be better off ordering it online somewhere.

See what they got. Compare prices (and don't forget to add in shipping for online orders....) and see which way best meets your budget/desires.