See the site and contact AeroCourse
http://www.aerocourse.com - they are currently the best way of preparing for the Canadian exams. They do ATPL, IFR, CRM and others at locations across Canada.
With your experience it should be a snap... and you will make some good contacts with the other attendees - I have seen a deHavilland Global Express test pilot there, and the DOT inspectors do refreshers withn these folks too.
It's a very good way of getting up to speed - very big bang for the buck.
If you have never written canadian exams before, you will have several to write (not just the two ATPL and the IFR). Exams currently run about $115 per copy.
Also expect some bureaucratic runaround each time you go to write (in my experience it can take the TC staff up to an hour to crank through their coffee and opening-up chores, and after all that you still have to do some walking around to pay for the exam). I say this because I was almost upset for the same reasons and I have seen others really get thrown for a loop because they were 100% prepared for the exam, but not prepared at all for the runaround.
Best of luck...