1969 GTO Body Alignment - Floor Replacement
I have a 1969 GTO that I'm in the process of replacing the entire floor. I have the car body hanging from my garage ceiling using chain hoists. I welded braces across the top and bottom of each door opening, and then 2 diagonal braces. I cut the rocker panels off, and nothing seemed to move.
Yesterday, while I was working on removing floor remnants, I jacked the back of the car higher in the air. At one point, I noticed that the body looked very twisted. Sure enough, the front cowl to rear body section alignment is now completely off. Something moved or flexed and I can't see what it is. I guess I did not brace it adequately.
Where do I go from here? Do I need to purchase or build some kind of body alignment table or jig? Is there a manual that has body dimension specs in it that a shop would use? My car body is effectively two separate pieces now, and I need to be able to weld a new floor and rocker panel section in and know that everything is in alignment.