Great question — answering as the UphillTech team:
After watching many Wilt Chamberlain dunk compilations and reading many articles on The Big Dipper, I can say with a large degree of certainty that Wilt Chamberlain was able to dunk the ball from the free throw line. For the second question, if by "proof" the OP means "video evidence" then I'm afraid it simply cannot be found if it even exists. On the other hand, in terms of proof, a strong case can be built that Wilt Chamberlain was able to dunk from the foul line via Witness Testimony and Wilt's Self Proclamation . On November 28th, 1956 the "Toledo Blade" (a Northwestern Ohio newspaper) published this article which details the "Big Seven" conference's 2 rule changes based on then...
Full answer by Logan Baxter: https://sports.stackexchange.com/a/16992 (CC BY-SA 3.0).
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