Just a thought - if you haven't pulled the body off yet you might want to do some cross bracing so the body doesn't twist. It might not be a problem if you are just jacking it up with jacks but if you are going to lift it with an overhead crane I would recommend it. Look closly at Marks pictures in his link above. I had all my doors off so I was concerned it would twist so I put an "X" brace across the back. I used the hinge bolt holes and made brackets and welded "Rebar" across the opening. I also did the doors with some bracing. My panel had significant rust out in the floors so I wasn't sure how strong the body was.
