Body panel replacement

Not on a rotisserie. Our old cars flex a bit. Jack one up at the center of the K frame with a tape measure from the center of the core support to the firewall. It might change. Best to set it level and square the rockers w the floor. Take measurements first. You need a point of reference when you replace several panels. Once you get them welded in say, 75%, you can move to a rotisserie to get the hard to reach spots.