Very hard to come over any solid info on these guys. Especially Garofalo and Zaccaria who managed to duck the radar. Like real oldtimers!

Olimpio GAROFALO
Birth Date: 13 Jun 1904
Death Date: Nov 1986
Social Security Number: 107-18-6348
State or Territory Where Number Was Issued: New York

Death Residence Localities
ZIP Code: 10003
Localities: Cooper, New York,

He doesn´t seem to have had a major rapsheet, so he was pretty much unkown to the authorities. Pretty much an old timer who made his money by bookmaking. In the 80s, FBI listed his address as 151 2nd Avenue, New York, NY.

Paul Robert ZACCARIA
Birth Date: 5 Jul 1924
Death Date: 10 Feb 2007
Social Security Number: 111-18-9416
State or Territory Where Number Was Issued: New York

Death Residence Localities
ZIP Code: 11224
Localities: Brooklyn, Kings, New York

As you said, Paulie Zack became mentor to Mickey Scars.
His father (Carlo Zaccaria), was also a mafiamember and close to the Castellano/Gambino clan. In the 80s, the FBI listed his address as 2268 National Drive, Brooklyn, NY.

When it comes to D´Amico, I doubt that I have more info on him than what´s already out on the internet.