In our "Model Center" (tab at the top of the page) you can get a lot of information about your 1978. Depending upon what it is you are looking for. Also there are a couple of 1978 Registry's out there that may be of help.
If you looking for ownership history, I doubt the VIN will help much. Prior registrations and lic. would probably do more. I've head of people having friends that work for a Chevrolet Garage and run the VIN on there maint. and recall and come up with a little of the past history. Good Luck