There is
this.
Bush, Sr., has said he was not with the CIA before being appointed director by President Ford in early 1976. But there's a memo from FBI Director J. Edgar Hoover to the State Department dated November 28, 1963, indicating otherwise. It concerns information developed by the Miami FBI office about groups in Miami seeking to blame the JFK murder on the Cuban government, and it says the information was orally furnished on November 23 to "George Bush of the CIA." Bush was in Dallas then. As was another CIA operative, Chauncey Holt (now deceased), who identified Posada as being in Dealey Plaza at the time of the murder.
Skimming it, my opinion is the article goes into my read queue. YMMV.
-Hoot