Yes, it was a whole belly (13.5 lbs). I did cut it down to fit (leftover pieces slated to become bacon soon).
It fully covered the loin initially, but it shrank a bit during cooking to expose the top of the loin. No harm, gave it a bit of crust on the top. It might not look that way in the photo, as I didn't "square up" the ends of the belly first, so the skin doesn't completely envelope the loin, but the belly did. Plus, I didn't do such a great job tieing it up; it was a little loose.
Details to correct the next time.