I see this as a legal connexion:

----------------------
AC 939 FLL 12:05 YYZ 15:13
-> AC 991 YYZ 16:15 MEX 20:00

However, from YYZ web site it seems coming from the US we will have to get the check baggage put them back on the connexion belt and go through Canadian Immigration. How can this be done in 62 minutes + the walk from our arrival gate to our departure gate? Any experience with similar US to International connexion in YYZ?

There are no other AC flights from FLL the day I need to travel.