Fails Emission Test: Carbureted

Ensure engine is reaching normal operating temperature.
Ensure there are no vacuum leaks.
Verify vacuum hose routing is correct.
Verify correct carburetor idle and fuel mixture adjustment.
Ensure fuel level is at specified mark on carburetor sight glass.
Verify base timing is correct and that timing advance system is functional.
Verify choke is fully open after engine is warm.
Verify mixture control solenoid operation is correct.
Check for catalytic converter contamination.
Check EGR valve and solenoid operation.