I live 3 miles from there! From 66 you can take the 234 bypass, not the first one you come to on 66, but the secnond one! The first 234 exit will get you there, but out of the way on Sudly.
Go east on the 234 bypass, when you come you come to the 28 exit for Nokesville, exit right, go about 1/4 mile and you are there.
If you look on mapquest, look for the manassas airport, just down the street.
Very fun on Sat. nights,, usually around 2 hundred or more cars show up. They range from Viper to Cobras, blown rods, and such...
Mark