I think they're taking 18, as I can figure it. Haven't heard for sure on a couple, but they are guys who basically hit every USAC dirt show.
1 Swindell
2B Darland
5 Weir
7 Clauson
9 Sweet
11 Windom
13 Hockett
20 Levi
21 Hines
29 Bud
30 Boat
37 Wise
67 Hagen
67K Whitt
67x Clarke
69 Coons
71 Gardner
81 Ballou