For racing you want to be able to slip the clutch a little to keep from breaking parts. You probably should talk to Ram for the best clutch for your needs. The best clutch for racing probably won't be the best for the street.

Donald

69 Dart swinger 417 W8 Liberty 5 speed
6.03 @114/9.49 @141 on motor 5.30 @131 on juice 1/8th mile 28x10.5's at 3200lbs
70 Challenger RT 440 4-speed 4:10 Dana

http://www.youtube.com/watch?v=VowFy4nDdfI