IMO body is about 90% of the value of these trucks. (Torsion boxes under behind the rocker panel supports the body with the top off) The drive train can be updated. Main factors for a family hauler safety, roll bar, or cage. This is not a cheap hobby, Most parts are available. Check out this build, big boxes in front of the wheel wells post #4-photo #3 are most important, these hold the door gaps also....
http://67-72chevytrucks.com/vboard/s...d.php?t=631802