Make sure with local laws you don't need an EGR valve, and order a custom chip for the increased airflow and to turn off the SES light (egr code)
Vortec carb intake with egr
http://sdparts.com/details/gm-perfor...parts/12496820
Vortec TBI with egr
http://sdparts.com/details/gm-perfor...parts/12496821