You'll have the change out the whole front clip, sheet metal. Hood, fenders, inner fenders, headlights, marker lights, grille, bumper, lower valance, and prolly a little more. Basically you'd be doing a 2000 to 2004-2005 front end conversion.
2002 Silverado 2500HD LB7 CCSB LT
EFI Live by Rob at ATP, Edge CTS Insight DSP 5 control, S&B CAI, PPE boost valve, Pro Fab AIH, AirDog II 165, PPE WIF sensor delete plug, 5" stainless exhaust, Cognito braces & HD tie rods, H2's 315/70 R17 BFG's
2004 Tahoe LT
2006 Silverado Z71 LS
1971 Chevy C10