[Superfan1]

From the Bradenton website; here are the Cobra Jet Showdown Rules:

Minimum weights and Index based on engine combination and Stock or Super Stock status:
Engine Combo Wt. w/driver Stk. Index SS Index
3V 4.6 3150 11.9 11.5
427/428 3200 10.6 10.2
5.0L NA 3150 11.4 11
352/363 3200 11.2 10.8
5.0L SC 3325 9.95 9.6
4.0L SC 5.4L 3250 N/A 9.3
2.3L SC 5.4L 3325 10.1 9.9

Holbrook's runs were indeed impressive because his index was 9.95 (5.0L SC 3325 9.95 9.6); but remember the AAA/SA index is 9.70 not 9.95
On the other hand Drew Skillman's index was 9.3 (4.0L SC 5.4L 3250 N/A 9.3). He was in Super Stock trim as noted by the 4.0L blower, and the fact that Stock was not an option as noted by the N/A for Stock index. He definitely was not in AA/SA trim. The qualifying sheet below verifies the indexes that were being used.