"It’s so cool because it’s never been done before," Busch said in Victory Lane.
The final laps were no breeze for Busch, however. First a debris caution came out with 11 to go in the originally scheduled 160-lap portion of the race, setting up a series of wild restarts.
Kenseth finished second, with Jimmie Johnson, Denny Hamlin and Kyle Larson rounding out the top five.
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Stewart, racing for the final time at his home track in the Sprint Cup Series, suffered a costly pit-road speeding during a caution with 40 laps to go. The penalty put him one lap down in 30th, but he battled back.