According to the Motor Emission Application Guide a 1976 Chevy K2500 with a 5.7 Liter engine which is 49-State emissions certified is required to be equipped with the following smog parts:
PCV - Positive Crank Ventilation
ACL - Preheat Tube for Air Filter Housing
EGR - Exhaust Gas Recirculation Valve
EVAP - Evaporative System
CAT - One (1) OC Type Catalytic Converter
SPK - Vacuum Spark Advance Control
