Appropriate place to post - I've uncovered the specific historical details of Wilt's free throw dunking tall tale and dug up all the ORIGINAL sources (None of the second hand account rubbish):
The NCAA Coach's Committee Proposal For 1956 NCAA Rule Changes
March 24, 1956
(Nationally Circulated Story)
Near the end of the 1955-56 NCAA season, the Coaches Committee appears to have organized, and voted on taking 4 new rule change suggestions too the next level up (The Rules and Regulations Committee) in the hopes for some new changes that would further diminish the dominance of athletic big men in college basketball. This curtails 2 rule changes that were made the prior season to address the big man dominance of Bill Russell and the other (now forgotten) NCAA stud at the time Bill Uhl. Both of whom were graduating in the next few months - these new rules are quietly focused on the up and coming NCAA big man, Wilt Chamberlain. Highlighted, is 2 rule proposals that are important to note. Releasing the ball from behind the free throw line, and no inbound passes above the backboard.
Two days later: Basketball Rules and Regulations Committee Approves Rule Changes
March 26, 1956
(Nationally Circulated Story)
Highlighted:
Another rules change says no player may have his foot into the free throw lane when a free throw is attempted until the ball hits the cylinder or backboard. Previously a player could leap into the lane so long as his foot did not touch the floor until the ball hit the cylinder or backboard. "This caused some cheating" said Hayes. "The man on the free throw line would leap into the air and dunk the ball in."
Interestingly, although they mention Wilt directly in the beginning of this article there is still no specification as to who the cheating free throw dunker/'s is/are. But they definitely are convinced one/some exists. Who could he/they be?... Hmmm....
Eight Months Later, A Northwest Ohio Newspaper Runs A Story That Reveals The Previously Unspecified Free Throw Dunker
November 28, 1956
The Toledo Blade
The Devil is in the details... And now we've got some. It looks like a fellow by the name of Tex Winter (the coach at Kansas State) was the first man to complain of Wilt Chamberlain dunking free throws to the Coaches Committee.
It seems Wilt has an unorthodox method of shooting free throws. The big guy takes aim at the basket from several feet behind the line. Then he takes about three giant steps, leaves his feet before reaching the line, and stuffs the ball through the hoop. Under the old rule, it was perfectly legal as Wilt never touched the floor before letting go of the ball. In addition his percentage was fantastic. "Why, he would have had a free throw percentage of 100," said [Tex] Winter. "He never missed." Incidentally the rules committee did not mention Chamberlain by name as a reason for the change. The rule change was made, according to the committee, "to prevent freak activity."
Thirty-Three Years Later, Wilt, For The First Time In His Life, Publicly Makes Mention That He Used To Dunk Free Throws As A Freshman In College
The Leaping Legends Of Basketball : Some Of The Names Will Jump Out At You, Others Won't; But All Of Them Took Their Games To Lofty Heights - Page 5 - Los Angeles Times
Los Angeles Times
February 12, 1989
"When I was a freshman, I fooled around with shooting free throws this way: For some reason, I thought you had to stay within the top half of that free-throw circle, so I would step back to just inside the top of the circle, take off from behind the line and dunk. They outlawed that, but I wouldn't have done it in a game, anyway. I was a good free throw shooter in college."
Actually he was a 62% free throw shooter, which is poor except in comparison to his 51% as a pro.
This is the
first time Wilt publicly mentions free-throw dunks.
Fifty-Five Years Later Tex Winter Recalls His Eyewitness Account In Detail In An Interview About Coaching Against Wilt Chamberlain (conversation about event begins at 3:45 minute mark)
BBall Breakdown
August 1st, 2011
Literally, almost word for word what he says perfectly matches every event that previously was recorded in history.
By the way, the way Tex describes Wilt taking just 3 strides before he dunked from behind the foul line? Well, take a look at Wilt's high-jump form @ the 0:42 mark. He takes EXACTLY 3 long strides for his high jump approach (I've seen several track meet films of his, he always used 3 strides), I'd bet that's exactly how he approached the free throw line. Closest thing we'll ever see to the feat.
[ame]https://www.youtube.com/watch?v=iwvdsi6gLl8[/ame]
that'd be a good luck breh 
Sorry not even close.