Because that is such a classic car, I would hesitate to alter it to the extent that you can put a PC in it. It simply speaks for itself, there's no need to try to make it more than it is. You'll only detract from it.
20 years from now, that car will be closing in on 50 years old. An iPad alteration will look ridiculous and destroy any value to it. I vote you keep it stock and put the car PC in a recent car, perhaps a daily driver.