Welcome to Stovebolt! As some of the others said your VIN very well could be the engine number and if you want to keep that number check the boss behind the distributer to see if that number matches your title. You may have to scrape some crud off of the boss to read it.
If you want to know positively call 1-800-222-1020 which is GM Customer Service. They will take your VIN and send you an amazing amount of information on your bolt INCLUDING where to find the VIN and how to decode it. You get all kinds of techinical info and it's FREE if you live in the states. It took about two weeks for mine to arrive after I called. You won't be sorry you called.

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.