Redmike,
To do a current Nimitz, will require several changes to the 1975 version of the kit. Sponson's have changed, in shape and location, the main mast is very different and the after radar mast has changed too.
There are photos of the "new" Nimitz available at www.news.navy.mil, the Navy's Newstand site, that would help give you an idea of what would be involved. The after mast could be done by using the GMM PE parts for the later Nimitz class ships, Washington, Stennis, Truman. With just a little detail tweaking that would work.
After the refueling and complex overhaul the Nimitz began to operate Super Hornets. VFA-41 the Black Aces, for one. The Nimitz hasn't operated Tomcats at all. I build 700/720 scale, so I don't know off hand if anyone is making 1/350 E and F super bugs yet. Nor do I know about the correct decals. Again the Navy site can help.
The new island configuration is much closer to the original, from a modeling standpoint, than a later period, pre RCOH, Nimitz would be. There are significant changes, in details, but the basic shape is better. That's a help.
There's plenty of Enterprise photos avilable too, if you want to check that out.
Have fun.