Th warping happens in the larger surface area panels that do not have compound curves or internal supports of any significance. This would include your hood, roof, cab rear panel, etc. The inner fenders, front fenders should be okay to blast BUT you will need to be careful and hit the metal at an angle to prevent the full blast effect. Many people do not like to sand blast due to the warping it can cause. My experience with this is from the blasting I did on some 54 metal. It worked fine on the fenders but I did not use it on the big panels.
To strip paint I would suggest either a DA sander, knotted wire wheel on a grinder, chemicals or media blasting but that would probably be your most expensive option. It is dirty work that takes time.
