It would be best to get it on an alignment rack in order to get the correct tolerances set back in and to help stabilize the overall structure for the necessary repairs. That way you can be rest assured the car is true. Another suggestion, if it is possible along with a rack is to dismantle the car down to a shell. That way is is easier to set in temporary bracing, spot weld in new structural members and sheet steel without being encumbered or the worry of setting your car on fire. Attached is an image from the 1967 Ford factory service manual as to the correct measurements.
