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Mark, I have a Shell Valley with a FE and I had the same problem with the cooling , call the radiator manufacture you have with the model number ,you maybe in the same boat I was in, THE RADIATOR is to small and will never handle an FE and the the electric fan that came with the car won't cut it . Remember they are what you call { the low bidder } and according to them the radiator I had was to small . I replaced the radiator with a larger unit and replaced the fan with a 2002 Viper fan .
The radiator company engineer said he has seen and hear of Kit car manufactures using terms like " good to 450 HP " which he said is silly . Its more inline with big block or small block than HP . Best of luck