How much difference will it make?

The next time you run the car have someone slo-mo video the launch with their phone. A guess, you are over-sprung at both ends for drag racing. Two schools of thought. Control the suspension with stiff springs or light springs and the shocks. Light springs and shocks are the way to go. The extra height in the rear that the ss springs gives you just increases your % of rise in a car known for having a pretty high amount already. Take a picture directly from the side of car. Picture a point about where the shifter ball would be if it were a stick car. That would be a gross estimate of the center of gravity for the car. Now draw a line parallel to the ground through that point. Now draw a second line from the contact patch of the rear tire through the front leaf spring mount(which is your instant center)up through the other line. Where the two lines meet is your % of rise. The farther to the rear, the more likely the rear of the car will rise and it will have less leverage to transfer weight. Which the big front torsion bars are not helping. They have very little, if any stored energy with which to transfer weight. We really need to see what the car is doing now.