I wish I had seen this earlier. Had he same issue with our first 67 notchback while working at Robbins Tire/Auto in Powdersville. Brand new alignment rack too. Mine was the 4th car on it.
Although everything about the 67 steering shaft is master splined, Removing the master spline from the steering wheel hub is easy. You would need a steering wheel puller and a small file. Yep, I had to do that.
Keep this in mind since the alignment rack may not get it perfect. Factors that play in to steering wheel position are, wear in steering gear, movement in a poorly designed ( 67 ) idler arm, crown in paved roads, radial tire pull, and the drive line / track offset built into the car.
If the alignment rack you access has been calibrated regularly or recently, it will set up the car for proper tire wear. Where the steering wheel rests while driving a straight road is secondary to that.
The saddest part, There are a lot of shops that don't pony up the cost to have their rack recalibrated regularly. My personal belief, If every rack in use today was maintained as it should be, Moog, Bear, etc.., would need to hire more field service people.
