Looks to me like DiBella was acting boss for Persico. Franzese, Cantelupo, Bonavolonta and Fratianno all said he was acting boss. I think Scarpa may have said Persico only became official boss in 1980, but who knows what angle he was working.

https://www.nytimes.com/1977/06/05/...es-after-failure-of-overthrow-chief.html
I think this article is pretty interesting. Says that DiBella is official boss, but that the Persicos are the most powerful faction and DiBella massively favours them.