From USAC:

The makeup feature from the 2014 rainout will be run as the last event of the night. The feature will be lined up based on the finishing order of the first feature, all cars that finish on the lead lap of the first feature will be completely inverted followed by all cars that were at least one lap down in their finishing order. This makeup feature will be for prize money only, no points will be awarded for this event. Teams will be allowed to use a different car for the makeup feature without penalty.