Check out MHDRA website
http://www.mhdra.com/
Click on link to July 30 - Aug. 1 - NW National Open
Looks like the only classes run are going to be -
Top Comp - Combo (is this STK & SS?) - S/Comp - S/Gas - S/Street - S/Pro - Pro - etc...
No separate Stk - SS - Comp or Alky Classes.