Kamali claims 5'10/5'11....
I am 5'8.5" barefoot and met King at the 2007 Arnold Classic, identifying myself as a Getbigger.

He respected me, and had read my posts online as "Matt C', and gave me a free copy of my DVD!!!
However, I do not think he was even 5'8.5". Although I suppose anywhere between 5'7 and 5'9 would be possible, dependent on his posture and footwear at the time. He claimed 5'9.5" on Pro Bodybuilding Weekly, but I think he is probably closer to 5'8. Not short, but not tall - and 5'10 for a bodybuilder would be closing in on the tall range.