Help... Vin #'s dont match

If the VIN on the dash matches the title, and your state issued a title in your name, you should be good for most practical purposes. You probably will never be able to resell it as an original 340 car, but if you are planning to keep it and build it to your own liking, I don't see much of a problem. It might be a good idea to do some "rust repair" around the rear deck. If you are not comfortable about it all you can do is try to offload it, but you will probably take a hit on that. Oh, you might want to run that VIN from the rear deck and make sure it's not hot. If it is, then you do have a dilemma.