Carbureted vs Fuel Injected has different effects
Conventional wisdom is that heated intake air in a carbureted engine atomizes better prior to entering the cylinders. On a fuel injected engine, cooler air with a cold air induction system (intakes outside the sump rather than running through it) provide more oxygen thus more power. The ECI website states that for every 10 degree cooler the intake air is, there is a 1% increase in power. Somewhere within all that, there is more than likely the truth that carbs make better use of heated air to atomize fuel, and injected engines get more power with the cooler air.