ant,
There's no need to convert your GPA to percentages since this is how most schools will look at you (even if they quote their medians in terms of percentages). Anyways, 3.74 is around an 84% average. However, it's a misconception that UofT only takes the best 3/4 years. They will consider all 4 years.
For admissions, with a 3.74/176 you are in at both UofT and UBC.
EDIT: Sorry, you said 176(96%)...did you mean 166? or 176? anyways, if its 176 you're def. in at UofT. If its 166, you're boarderline (maybe waitlist UofT maybe admit depending on your other stuff like major, undergrad school, ec's, we, etc.)