I'll third what was above......broadside is fine, just behind the shoulder and mid body, you will have a dead bear. Understand that with decent shot placement bears are pretty easy to kill, and normally don't go far. As Darrell said take your time, and do all you can between now and then to familiarize yourself with what a big bear looks like. Normally small looking ears=big bear, big ears=small bear.
The last time I hunted in Quebec I didn't shoot until the sixth day and 19th bear, I saw some decent ones, but when this one came in I knew right off. I knew he was there that morning while baiting when I saw new piles of poop, much bigger that anything we had seen all week.
Have fun with it.....
David