For those of you running overhead valves - do you have a cold problem? My car won't move an inch when it's cold regardless of the choke setting. Once warmed up it goes like a scalded cat but it takes 2+ minutes of idling before it will move. The story of my plight and photos are here on my website: http://tfoye.com/MTE/GreenThunderbolt.htm It's been re-jetting to just about every size imaginable and various warming techniques applied.
If you have a solution or a better carburetor I would like to know what you're using.
The Chevrolet used a hot air pipe that came off a stove on the exhaust pipe.