What you plan to do is not recommended for the following reasons--unless you plan to overmat the print right to the edge of the print. But I assume you do not plan to do that. The large white borders of glossy paper will be the brightest thing the eye sees when looking at your print. It will be distracting from the tones of the print itself.
So why a large black border? That is not good either, as a large black area surrounding the print will make any light tone close to the edge of the print difficult to evaluate. Those tones will look blown out.
If you overmat the print right to the edge then the large white border you propose as fine, but if you are going to do that why waste half the sheet of paper?
Michael A. Smith