I'm replacing the water neck on my 14 coyote mustang to the 2015-17 water neck which allows use of the 2018 intake manifold without grinding. The overflow nipple on top do you just pull it out & reinstall? Any particular sealant necessary? Its not a threaded connection so thats the only way I see doing this and I'd rather not **** it up. Apparently this part doesn't come with the replacement neck so I need to reuse the old one. TIA