Illustrator :: Converted A Large Document From RGB To CYMK

I converted a large document from RGB to CYMK (File | Document Color Mode). I'd like to select all of the text that was RGB(0,0,0) and is now CMYK(75.02,67.97,67.02,90.16) so I can change it to CMYK(0,0,0,100). I think the magic wand is the way to do this (correct me if I'm wrong).
 
I have text in a dozen or more text areas. Many of the text areas overflow text into another text area. Some of the text in the text areas is "black" but there is also text with other colors that I'd like to remain unchanged.
 
For example, I'd like to select all of the black text in the following two text areas without selecting the red text. I thought  that I could click on the black text and have all the black text (but not the red text), selected, but the entire text box is selected (and nothing in the second text box is selected). Can the wand select some text within several text boxes? If not, how should I go about changing the black?