Ifor Whittaker, formerly Colin Pritchard, was convicted of abusing the boy, aged between 10 and 16 when the abuse happened in the 1980s and 1990s.
The 73-year-old also conspired with ex-clergyman Roy Cotton, who has since died, to commit sex acts.
Whittaker, of Rectory Road, Sutton, south London, was jailed for 16 years.
He was told he will serve a minimum of 10 years in prison. He is already a registered sex offender for life after a previous conviction.
Sentencing Whittaker, Judge Paul Tain described the priest's behaviour as "disgraceful, disgusting and despicable",
He said: "It was an obvious and clear case of grooming, where he carefully manipulated a vulnerable child."
Whittaker had "attempted to bamboozle, cheat and mislead the jury", the judge said.
He said the abuser had "plied the victim with alcohol" and "emotionally blackmailed the boy by saying 'no one would believe you over a priest'".
Whittaker, a former rector of Sedlescombe, near Battle, was convicted of seven counts, which also included gross indecency and inciting the boy to commit gross indecency.
The offences took place between February 1987 and February 1993 in East Sussex, Hove Crown Court was told.
The jury was told Whittaker was a "predatory paedophile" and had organised and facilitated the abuse with Cotton, who worked as a priest in Brede, near Rye, in the 1990s.
He died in 2006 and was never prosecuted.
The victim, now in his 40s, told the court Cotton had been the main abuser and had "just passed me over like a toy to be borrowed by a friend".
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