repairing front frame rails 65 cuda

I say put jack stands under the rockers and a set at the very front and rear to support the body position and get the front rail level. Then drill the spot welds from the floor inner fender and core support. Then the replacement rail will go up into place with the floors still intact with the firewall and inner fenders including the core support. If you get my thinking just remove the rail and leave all else intact with stands placed as I said. Doing one rail at a time should keep all in alignment. The reason the door opens hard with the stands under the A arm is you are causing body flex at the A pillar where the door mounts. Also putting a full used rail in it would look correct and not a cap which to me looks like an ugly hack. I have seen E bodies with caps and can tell you I would never want to buy anything that looks crappy and like it was hacked.