Sorry I should be more specific: 81A/K on the older aircraft would be good for you, but I suspect you might get one of the newer ones, so you'll be looking at trying to snag row 80 for emergency exit - those are only assigned at check-in at the airport. You'll have to head to the airport early if you want to secure them (they are first come first served).

EK won't upgrade you just because you are tall unfortunately - although they do offer discounted space available upgrades at some USA airports, so you might be able to take advantage of that.