Does a 1976 dodge power wagon have catalytic converter?

No, a 1976 Dodge Power Wagon did not have a catalytic converter. Catalytic converters weren't mandated in the US until the 1975 model year for some vehicles, but even then, their adoption was gradual and varied by engine size and vehicle type. The 1976 Power Wagon, being a heavy-duty truck, likely predated widespread catalytic converter use.