frame off; help

[keith808]

I tried searching for the answer, but need help.
I will be removing body from chasis this weekend on 69 squareback. I have read that the body might bend or twist and will not line back up later. I also read that welding a bar to A abd B pilar will stop this. So my question is where exactly(upper lower by the rocker or roof) and what direction on the pilars(front back / driver to passenger)?
Can anyone help with specifics??????
Or is there a better way?
Mahalo from Hawaii>>>>>>>
Keith