What is this capped outlet on near my water intake?

["N. L. Devotie" <noble_leslie_devotie@xxxxxxxxx>]

Can anyone tell me what this apparently capped connection near my water intake is?  The attached pic is from a 383 in a 65 Coronet 440.  I don't know what year the engine is.  On a semi-related note, how can I find out what year the engine is?
-nld

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