Stupid question? Can I replace my torsionbars and leafsprings for coilovers?

Before you go through all this, look at this. This is a leaf spring rear............It's been over 180 in the 1/8th........I haven't kept up on the latest from them..........

Obsession and Inspiration: Jason Digby and Lyle Barnett teamed up to take down the Leaf Spring record at Lights Out 8 - Hot Rod Network

Dominant Dodge: Jason Digby's 1969 Leaf Spring Dodge Dart