Yes, I basicly agree with Eric.
What I woulkd do is, carewfully jack up under left front wheel suspension and determine if there is any difference in the door closures. Then the same from the other side, same on rear, under the rear axle. Then you know pretty well what the integrity of the body is. The usual jack point (if you have the Rootes jack) are at the end of the fram rails, but often not very solid.
Now jack it up under the front crossmember and the rear axle. That should work ok.
Good luck with the project you have ahead of you. I did almost the same, but nowalmost 20 years ago.
Robert
PS. Take plenty of digital pictures before you take anything apar! It is amazing how long the project can take, one never knows. You think you can remember, but believe me, a picture, makes reassembly that much easier. No thinking should this go this way or upside down, etc…