2004 Silverado Z71 Tires

I Just Cranked My Torsion Bars On My New Truck. I Had Bf Goodrich 285/75/16,s On My Last Truck(99 Sierra). I Was Wondering What Would Fit On My 04. Since I Raised The Front End Will I Be Able To Go Wider? Taller? The 04 Has 17 Inch Wheels Instead Of 16's, So I May Need 70's Instead Of 75's. Your Advice Will Be Very Appreciated.

Not really sure what's available in a 17" tire. I can tell you that 305/70/16's fit well on my stock 99 sierra Z-71.