It is tight but if I find emirates brilliant in those situations. I flew back to CPT a few weeks ago from MAN on EK20 connecting to EK770 (85 minute connection)
EK20 was late leaving Manchester, and before I had even left the lounge, the guy comes over to tell me I had already been moved on to flight EK778 which departed to Cape Town 2 hours later than my original EK770. They even changed my chauffeur booking etc in Cape town.
no need to worry