How about a coat of paint and a few patches on the 3 S5's in Huntsville, Cape C and Houston?
A little LOx anyone?
I hear they were Moon ready when they pulled the plug on Apollo 18...
If we're serious about getting really heavy-lift capability back, then we need to start where the Saturn V left off. The Delta 4, and even the shuttle, are just wannabes compared to the Saturn.
Of course, after 30 years of open storage they aren't much more than interesting piles of metal fatigue and corrosion.
It'd be far cheaper to build from scratch. NONE of the Saturn V support infrastructure exists anymore, and NONE of the electronics on the boosters themselves has been manufactured for decades.