Thanks. Yes, the rust is on both sides. If you were sitting in the car with the window down & your arm on the window, where your hand would fall on the roof is exactly where it is rusting on both sides.

That would be an ODD spot for a 64 to start rusting!! Is it only on one side or both? If the car had been repainted chances are pretty good that their is a prep failure or some water got into the paint or that one spot wasnt treated correctly due to, who-knows-what? The only way to truly know would be to sand that area back to metal, prep it correctly and re-paint that area. If the paint is base-coat clear-coat feathering the paint to match shouldnt be to big of an issue!