Need spark control valve for 1977 C-10

This is a two vacuum port item, cylindrical in shape which sits on the front of the intake manifold . The truck is equipped with a 350 Chev and has Calif. emissions, but no EGR valve.
Anyone know where to get a replacemnet? Chevrolet says the part number is 460111. But no longer in service.
Any aftermarket supplilers?
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If it is green in color with two vacuume ports OEM # 3031386 NAPA # CRB21180. Number found at NAPA web sight.
John

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