My understanding is that it's pretty easy to match with a residency program in general surgery. In fact, about 7% of the general surgery residency positions go unfilled each year. The hard part is actually completing the residency, not getting in. Of course, as with any residency program, some programs are more selective than others. If you're interested in a particular program, you might look at that program's web site and view the profiles of their residents.
I'd imagine that a medical school's placement rate into surgery residency programs is highly correlated with placement into residency programs in general. Most schools publish stats on the % of students that match with their first choice. But bear in mind that students from more prestigious schools tend to apply to more prestigious residency programs, which distorts the numbers a bit.
You might search through the Allopathic forum for more information on this topic.