SHAKE HIM TILL HE RATTLES ? North Beach, San Francisco: It is the early 1960's and the beat scene is changing. The Narco Squad are coming down heavy. One particular narc, Lieutenant Carver, really has it in for Lee Cabiness. All Cabiness wants to do is jam on his sax, score some weed and hang with the action. He had a thing going with Jean but that's cooled off, and now she's going with that flashy pimp, Randozza. One night Cabiness's friend Furg introduces him to Clair Hubler, a slumming rich girl who wants to hire them for a private party. She's got an anti-guy vibe but you never know. But all Furg wants to do is score some junk to find out what all the excitement's about. Naturally he thinks of Sullivan, the local junkie playwright. But Sullivan has a problem?Carver is using him to set up his friends. One summer in North Beach, they all collide. That's when things get crazy, real crazy. ? ? IT'S COLD OUT THERE ? JD Bing is out from San Quentin, just trying to get by selling encyclopedias?but he's not very good at it. In fact, he's getting desperate. Kristie has just lost her airline job and is hold