Find some Chevelle specific websites and I am sure you will find one that has VIN decoding. Google it up with the right words (1972, Chevelle, VIN, decoding, etc...)
Most DMVs will allow you to buy title history information. The process and the exact informaiton available changes state to state. Check your local DMV website or contact you local office to find out what you need to do and what information you will obtain.