fjtorres -- as far as this being on the NY Times bestseller list -- I'm afraid you have been at least partly hoaxed yourself.
The August 1, 1956
Wall Street Journal article says nothing about being on the bestseller list before publication:
http://web.archive.org/web/200204270...-56/8-1-56.jpg
Neither does the
New York Times article on the original hoax (Book Review page 5, August 5, 1956).
Nor does the
New York Times review of the published book (Book Review page page 21, September 16, 1956).
Via my public library's web site, I checked the ProQuest indexing of the
New York Times for 1956 through 1958.
I, Libertine did not make the bestseller list, neither the hoax book nor the real one.
But I did love Jean Shepherd on the radio.