Since no one has answered:
"How ya doin', guy?" was Fat Andy, one of the guys Henry introduced in that early scene in Sonny's restaurant.
(BTW: the guy who played Fat Andy--Louis Eppolito--was one of the two former NYC detectives convicted in 2005 for having done hits for Anthony (Gaspipe) Casso, the boss of the Luchese Family.)

Q. "...because a rat will do anything to survive..."


Ntra la porta tua lu sangu � sparsu,
E nun me mporta si ce muoru accisu...
E s'iddu muoru e vaju mparadisu
Si nun ce truovo a ttia, mancu ce trasu.