You should go down to AutoZone, if you have one, and rent a steering wheel puller. You will need it. Then there should be a nut right in the center of the wheel, remove it, installer puller and pull. Not exactly sure on the 68 LeMans but there might be 2 screws on the back of the wheel that hold the wheel cover / horn switch assembly on. Take them out and that should give you access to the nut and shaft.