I've only ever seen Chase personally say that The Soprano's were based on the Boiardo crew. He's quoted in an article. All the other mentions of the DeCavalcante's & the Taccetta's, didn't come from Chase, at least I haven't seen it. The DeCalvacante's came from the members themselves who watched the show and were picked up on wiretaps comparing themselves to the characters. And I don't know where the Taccetta connection came from, but I've never heard or seen Chase himself refer to it.