273 stock coil location hitting vacuum advance

If you re-clock the intermediate shaft, you won't need to rearrange the spark plug wires. Better to keep them matching the marks on the cap to not confuse others. As I recall the manual, when at TDC compression #1, the slot in the shaft should point at the front left mounting bolt on the intake manifold. But, not required since all that is required is that the plugs fire with proper advance and order.