The only places Whites dominate in the NFL are as QB and on the Offensive line. These positions traditionally require the highest Wonderlic scores. Just for comparison, a Wonderlic of 20 is roughly the equivalent of a 100 IQ.
Offensive tackles: 26
Centers: 25
Quarterbacks: 24
Guards: 23
Tight Ends: 22
Safeties: 19
Middle linebackers: 19
Cornerbacks: 18
Wide receivers: 17
Fullbacks: 17
Halfbacks: 16