If this is not a race engine, there is no point. The object is to keep the hotter air away from under the carb. Cooler charge is more dense. If this is a street driven car, that area of the engine gets hot anyway from the thermal conduction. Having said that, IF you decide to do it anyway, the impact is minimal. Neither of my drivers have a functional choke and by the time I'm out fo the driveway, you'd never know it.