Poorboy and TJP have it down pat. I spent a lot of years building/rebuilding/tweaking carbs. Living in WI we got real good at tweaking stat housing and choke pull-offs. One of the biggest reasons there is no choke on my toy...hop in, pump it a couple times and start it up. Feather the throttle for a few and good to go. I've fired mine up in Feb when the temps were WELL below freezing...took a bit more to keep it running but it fired right up! 470" with a Holley 800 DP.