Put WDB in front of the old 14-digit VIN and you might get lucky. Not many places to record vehicle history back then.
Do Juffy Lube service 14 digit VIN cars today days ?
OP. It isn't clear what you are looking for with the 14 digit Chassis Number. If you are seeking CARFAX type information you likely can't find anything. If you are looking for the history, service records, etc. that is in the form of paper service records, the original maintenance booklet and other documents the owner may have. If you are trying to register a car with the DMV in most states the 14 digit Chassis Number is good. I had no problem registering my 250SL with the DMV in Virginia.
If Juffi Lube can service these cars in today days, why these records are impossible to get ? When the car made "back then" not means this car not exist today.