I just went and looked at a Dart the other day. Look near the rocker panels or right under the doors and all, Darts will rust there a lot. They say that Dart are known to rust out around the back panels a lot, now I am not sure if that's true but so far from what I have seen from those cars it is. Also go in the car and pull up the carpet and look at the floors and look in the door jams, etc, especially near the front. The Dart I wen't and looked at looked alright from a distance and then close up the whole under carrage was all rusted the entire engine compartment was rusted, all the panels on the front back, side, etc was rusted so bad it had holes in it and moss growing out of them. It also depends on where you live so if your on the West then you won't have to worry about that problem AS MUCH.