FYI, The dart "body" is the whole car itself. You can only take off the diff/ leaf springs, as well ast the front K member and suspension. There is no frame to remove the body from. I have seen a Dart placed on a Blazer frame. I thought that was kinda cool. But I am pretty sure that you couldn't take a body of a dart and place it on an avenger frame, because they too have no frame. So what Are you going to place it one?!?!?!
further more, I don't think any new cars have frames anymore. They are all unibodies ( the car is the frame)