Snubber, what do you think of them?

You definitely don't want softer leaf springs, especially with a stick! A temporary band-aid for stock-type leaf springs is to clamp each spring leaf to the main one to stiffen the front 1/2. Like fastbackcuda said, keep the snubber.

If you have any wheel hop, the stiffer springs as well as stiffer shocks will help control that. Smaller O.D. torsion bars will help weight tranfer and traction.

Experimenting with your accellerator pump squirters and pump may help performance also.

Hope you have a driveshaft loop!