Other casting choices I made while reading (and keep in mind that these are the early to mid 70s versions of these actors) are
Burt Young: Don Louie Russo Harrison Ford: James Kavanaugh Shea Martin Sheen: Danny Shea Gene Hackman: M. Corbett Shea Frederic Forrest: Joe Lucadello/Ike Rosen
"We've all heard the story of the canary who could sing, but couldn't fly"