To bondo or not to bondo?

As some of you have seen in my other posts, I have a 72 Newport. It has a little bit of rust at the bottoms of the quarter panels, (no holes yet.) It also has a few small spots of chipped paint on the nose of the hood (not rusted yet.) The car has it's original paint. My question is should I fix these problems before they get worse or leave them alone because of original paint. The problems are still small enough where its hard to spot glancing at the car.
Author: Jon O.