1972 Blazer - Smog Pump?

[1972Blaze]

Were any 1972 Blazers fitted with smog equipment? I read somewhere that they were not, but mine has an A/C bracket that has a space to attach a smog pump. Also it has a 3 groove water pump pulley with an empty groove for a smog pump belt presumably. For what it is worth, it is a California car with the YF5 California Assembly Line Emissions Test. If they did equip 72 Blazers with smog pumps, would the emissions test indicate that this vehicle originally had the pump? Thanks in advance for any help.