Early ABody Steering Wheel Splines Have an Index?

Can’t you unbolt the three bolts holding the steering wheel to the adapter and index it closer to center?
No. The wheel bolts to an aluminum adapter and then the adapter engages the splines on the shaft. He can remove the center nut and remove the wheel, adapter and all and reclock the adapter on the shaft. But yes, the steering shaft has a master spline. But those adapters do not, so they can clock anywhere.