In 1968, You Only Got a Small Portion, But It Was Still Spaghetti If you’ve never spent a Saturday afternoon trying to figure out which vacuum line goes where on that ’68 Cougar you bought from the guy who thought his vacuum system modifications would improve things, you’re very lucky. The fact is, even Lincoln/Mercury’s technicians needed occasional help when it came to untangling the spaghetti-like mass of vacuum lines under the hood of the ’68 model line.