Is there an electric choke conversion for a six pack setup???

In a pure stock setup, they come off pretty quick. I've never timed one but actually coolant has nothing to do with it. In a working factory setup, the heat riser is closed at startup forcing exhaust through the crossover in the intake. It's the hot exhaust that heats up the choke. The stock setup was problematic from the beginning though and that's why they went to an electric assist in the later models