I have the same (1982 380SL) car you have. Here are a couple of pictures that may help you trace that vacuum line to it's intended connection. From the photos, it appears that the vacumm line in question runs down to the the intake manifold area.
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82 380SL 41K miles sold, 98 SL500 44K miles, 13 C300 4Matic, 14 CLA-250 4Matic
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