I applied to QF long haul, on the application you have to indicate if you are outside their height restrictions (163-183cm). I am 193cm but have been flying on 737's for almost 3 years with no problems whatsoever... I believe the upper limit needs to be re-evaluated, as long haul crew fly on 767/747/A330 a/c which most certainly would not be inhibitive to someone of my height...
As far as the lower limit goes sorry I cant help!