Engine running due to stall converter???

Unless that converter is a piece of garbage and slipping like crazy I can't see it being the problem. I have a 4000 stall in my car and my 408 has never gone over 205 in hot city traffic or racing. I do have a radiator that takes full advantage of the core support opening. I'd check the timing and jetting like mentioned above and like RRR mentioned don't rule out the radiator being too small. BTW: I never had a lot of luck with electric fans. They can actually block some air flow when not running. Viscous is the way to go IMHO