The fight scene was filmed at Sloppy Joe's in Key West.
Although not listed as an adaptation of Howard Hawks' classic Humphrey Bogart film loosely based on Ernest Hemingway's To Have And Have Not, there are many similarities including a Florida boat charter captain picking up refugees for money with a drunk shipmate working for him.
Part of the "Drive In Cult Cinema Collection" of 200 Features: This movie is included on the same side as Fleshburn while the flip-side includes Land of the Minotaur.
The front of Sloppy Joe's cafe reads (in neon) "Hemingway's favorite bar" (plus he's mentioned in the movie). Without the credits, this movie is basically a remake of Ernest Hemingway's To Have And Have Not.
It's most likely actress Linda Scott is not Linda Gaye Scott as listed. The latter has close-set eyes and the actress here has eyes far apart. One if always blonde in movies and this actress is brunette with dark features. The actress here, Linda Scott, might have just done one movie, as often happens in low budget movies.