Richard Westbrook led the way in the final 30-minute practice before qualifying for tomorrow’s Continental Tire Sports Car Festival and Mazda Raceway Laguna Seca. The Englishman peddled his No. 90 Corvette DP to a best time of 1:1.687, which was a considerable 0.520 seconds quicker than Friday’s pace-setting GAINSCO/Bob Stallings…