My convertible has a 403, and the car had sat for quite a few years before i purchased it Ever since i have gotten it it will die after driving it for awhile it wont immeditly start back up but after 2-3 minutes it fires right up. I have replaced the carb and fuel pump. It almost sound like vapor lock? Also the gas in the car is very very old i have put new in but i bet there is a lot of water in the tank. any help is appreciated.