i have a carb on my 521 and i dont believe its stock since it doesnt seem to match fully up to the diagrams in the service manual. There are two sets of wires coming from it and I dont know where they go to. i have a few pictures, one is a circular tube housing and the other is a rectangular housing. And both have the same color wires coming from them, Blue and a Black.

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welcome to the forum.

Try looking here: http://www.olddatsuns.com/data...0.pdf

Most likely the vacuum control solenoid and anti-diesling solenoid wires. Not sure without pics.