The car most likely need a body bolt shim which will move that area up a wee bit. You can use a front end U-shaped alignment shim - loosen up everything but the first and last body bolt to frame bolt, have someone pull up on the side, slip it in place, then retighten. You might have to make a minor door latch adjustment, but the shim will correct that little bit of sag and your rub should go away. This is a normal adjustment on any car with separate frame and body assembly. The door gaps might move, but only slightly, but that's better then wearing paint off or having sticky doors that rattle.