And of course get rid of the Dex-cool (I think that started in '95?) if you haven't already and use one of the new replacement antifreezes. (Plugs can take a beating from Dex-Cool if it gets into the combustion areas, so remember to look at them/change them, while you have more elbow room.)
If you change the valve cover gaskets, the blue Felpro gaskets are awfully nice.
And of course the gearheads/admins will walk you through problems, if you listen to them and try what they say to do. They sure helped me alot when I did mine