There's another photo -- I can't Google it up -- from about 1963 that shows Wilt slamming over a terrified Zelmo Beaty, and Wilt must have the ball four feet above the basket.
While spending his year of freshman ineligibility at Kansas in 1956, Wilt was instructed by Phog Allen to do something to remedy his poor free throw shooting. After a quick look at the rule book, which said at the time that shooters simply
could not set foot in the lane before releasing a free throw, Chamberlain improved his percentage to 100.00 -- by simply retreating to midcourt, taking about three strides, taking off about a half-stride outside the FT line, and dunking. Which, it developed, he could do every time. Every single time. Fresh, tired, early in games, late in games. Whenever he felt like it, he could do it. Wisely, he was told not to try this in public -- only in closed practices.
One day some opposing coaches got wind of this, and approximately 10 minutes and 300 screams of "holy ****ing ****!!!" from the coaching fraternity later, a rules change was instantly rammed through to ban it.