Cooling system questions

So I've been working on my project 318 dart and am now moving onto cooling system. I've never worked on older cars and wanted to see if what I have is complete or not. I see the water pump and the fan attaches to a pulley on it but I don't have a fan clutch. The car is a 1970 but the motor from what I was told by previous owner is a 74 318. Should I have a fan clutch or was that not a factory thing back then? By the way a fan shroud is on my list of things to get. Thanks!

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