I have a 260. Bought it new and had it since then. Car set up for 2 years. After that it has not run right. Before then, it ran perfect. The problem began by pouring gas out of both carb vent tubes. Bought 2 kits, floats and power valves and had a guy who says he used to work for nissan rebuild the carbs. Since then it is no better. In fact it is worse at times. It still runs good when the operating temp is cold but when it reaches a certain temp. it goes crazy. It stars to cut out and goes dead when it is sitting still. I will welcome any suggestions to remedy this problem, however I do want to keep the car original.