1970 Dart Swinger - father and son project

I have started doing something other than weld patches, hoping a guy here will get me a drivers door and hoping the job interview I had yesterday leads to work so I can buy a drivers side quarter skin. Both of these are just needing replaced. Anyway, getting to the hood and have found that all the spots where the frame is stuck to the skin are loose. Have any of you run into this and if yes, how did you go about trying to correct? I notices a lot of "oil can" type action when sanding the paint off so I flipped it over and found this to be the reason. Any advice from someone who has been there would be greatly appreciated.:prayer: