Point gap

It will run at just about any gap, as long as the points actually close and actually open.
The specified gap is for new points in a new distributor, and is used to ballpark the dwell. The dwell is the thing that your coil is looking for.
Dwell is the time in degrees that the points are closed, causing a charge to build up inside the coil. When the points open, the coil fires it into the coilwire, to be distributed . The more dwell a system can generate the better, but there is a point that more is not necessarily useful. The coil works best, over a broad range of rpms, at the specified dwell, created by the specified pointgap.
That don't mean that it won't work at any other point gap.......