I'll get the obvious out of the way: this is an Italian movie in which everyone but Anthony Quinn and Capucine are dubbed by really ridiculous English voices. If you don't like Spaghetti Westerns, you're not going to make it through this one.
The Con Artists, one of many release titles, is 1970s Italian slapstick, so again, if you're not in the mood for that, you'll probably turn it off. I only stuck with it for love of Anthony Quinn, who looked very handsome in his silver-haired splendor. Tony and Italian actor Adriano Celentano are jailbirds who escape due to a series of bizarre con jobs on the prison guards. They team up for the larger goal of getting revenge on Tony's ex-wife, Capucine, but for the vast majority of the movie, they're just pulling pranks and con jobs on random people. For example, Tony wants a new suit, so after he's tried one on, Adriano tells the shop owner that Tony has leprosy. The shop owner tells Tony to leave the story immediately, and he gets to keep the suit without paying for it.
This is a pretty silly movie, one that only kids might like, if it weren't for the terrible dubbing that would make them tune out. Unless you're in love with the cast, you can skip this one. Try The Secret of Santa Vittoria instead.