The guys doing 150-170 mph use the GTR shocks/springs.
find the part number for the GTR shocks from the ultimate edition then swap in the revo springs. They have a xx long for the rear and I believe it was long for the front. For springs the revo springs below would be great.
Part #5442 Spring, shock (GTR) (4.9 rate silver) (std. front 120mm)
Part #5443 Spring, shock (GTR) (5.4 rate pink)
Part #5444 Spring, shock (GTR) (5.9 rate blue) (std. rear 120mm)
Part #5445 Spring, shock (GTR) (6.4 rate purple)