I don't know what the weather is like where you live, but here, the carb ices up and it floods your engine to the point of dying on high idle..... But then again, I live in a place where 90% Humidity and -20 is kinda normal. For your average lower 48 mildish winter, no heat crossover would be fine I guess. I just start my truck for like five minutes, then shut it off for a minute or so, then it heatsoaks the carb, and it is fine from then. Headers help the engine compartment temp a lot too, and an electric/viscous fan........