Digital BW, The Print

I am using an Epson 2200 and QTR to make black and white prints on
Epson Enhanced Matte paper. I am very happy with them. But a question.
If I substitute the Eboni black cartridge for the Epson MK will I get
significantly better blacks? Also can I use the Eboni for color
printing? And can I use the Eboni for B&W printing on glossy paper
instead of Epson PK? This may all be answered on the forum but I
couldn't find the answers.
Thanks,
Chuck