Since I have only driven my "new" 64 SB about 10 miles since I purchased it and proceeded to tear it down, I was wondering if living in Colorado I should worry about the car running too hot . . I noticed that GM had added some rubber radiator seals for the BB motors - should I add these? Is the fit of the shroud the critical seal or is it the seal between the radiator and bracket? Does anyone know of a hear resistant rubber that could be used for this?