Take a look at this old link.
https://fordbarn.com/forum/showthrea...lling+flywheel
With a jig it would be less of a problem. A good drill press could drill the starter hole then finish off with a good tap after any re-centering if required and finish drilling for the correct tap size. 8BA flywheels are drilled through so no bottoming tap would be needed.
If a person has a good mill and a rotary index table, the jig really wouldn't be needed. Most machine shops should be able to do this.