I am looking for a young adult novel that I read in the late 70's. The setting was an urban/city background called “Dogtown", a place in which the main character, Charlie, was doing everything he could to earn money to join his uncle to go off and use his uncle’s “new invention” to make a fortune. His uncle lived out of a VW bus that he also drove, and would come to town from time to time. Charlie’s friend Henry Etienne would help him and his efforts (they would salvage scrap; they farmed ladybugs in, I believe, the Sierra Molina canyons; at one point in the book, Charlie and Henry have a fake fight at a men’s club to earn tips). Charlie had a teacher, an Asian American man who rode a motor scooter, who encouraged Charlie to write down all of his ideas. At the climax of the story, we come to find out that the “new invention“ the uncle has is actually a fighting cock. Charlie and his uncle go to their first fight at which the rooster is killed, and the police bust up the illegal fight.

PLEASE help me find this book!