Lifted truck question

I bought a 2001 chevy Silverado 1500 recently and the truck rides pretty bad. It has a 6" block in the back and the torsion keys are maxed out I believe. All the shocks are blown out so I plan I replacing them but my question is could I buy longer shocks in the front so the shocks wouldn't be maxed out from the torsion keys being raised or could I buy a leveling kit that comes with 2" keys then buy new shocks that are 2 inches longer. Let my know what you guys think

I didn't find the right solution
References:

https://www.truckforums.com/forum/general-truck-tech-42/every-truck-manufacturer-swears-out-do-others-21429/

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