It was common pre '56 for states to use the engine number. With the number of titling questions we get on the 'bolt because a truck was titled with the engine number and the engine has been changed without re-titling, it never hurts to be cautious.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.