I'm flying into GRU via COPA from panama city arriving at 4am, and am going to book a flight out to Iguassu on the same day. Can someone tell me if 3h20m is enough to get through immigration, check in at TAM and get through security again for a domestic flight within Brazil?

I'm looking at the 7:20am direct flight so I can get into Iguassu at a decent time (my next option is to leave at 9am and only arrive at 2:40pm). Considering it's so early in the morning it would be okay, but I just read quite a few horror stories about the long lines so I don't want to risk it...

Please let me know!