Quentin Tarantino has picked his next project, and he's bringing Sly Stallone on to co-direct what sounds like an awesome, 1930s-type series ... TMZ has learned. Sources with direct knowledge tell TMZ ... the series is set in the '30s, and it will be super authentic. It'll be shot in black and white, using 1930s cameras. It's a 6-part series featuring gangsters, showgirls, boxing, and music. It's unclear if the cast has been picked, but we're told Sly will be behind the camera ... not in front