What colour is it underneath the black? Keep an eye out for cracking around the hinge points on the bonnet, door hinges and door locks as was common on the f series trucks because big bits of metal are getting slammed shut. Really annoying when you close the door and the lock falls in to the bottom of the door.
You may want to be careful sanding the doors and side of wings as may have been marked with a serial number or "official use only". When i seen this the vehicle was white and numbering blue from memory and if green the lettering is black