Look between the head and intake. There is a gasket there, it's either black or silver. Likely it's silver but it could be black. I saw a early 06 buick lacross at work today with black gaskets still.

As for the lines, yeah you could take the fitting out and use some of that white thread tape and re-install. I'd just do the lines anyway aswell, they will leak on you someday.


As for anything else, at 100k the plugs are do and the MAF sensor and throttle body should be cleaned up.