I haven't even used the choke in the past few year and haven't had any problems starting in the coldest weather Georgia has to offer. Usually the teens is about as cold as it gets. I think my ignition system has a lot to do with it because it became much less cold natured after that upgrade. I do have to hold the throttle for a minute or two; it won't just start and idle in those conditions. I'm thinking about removing the choke flapper so I can still use the fast idle function, but without actually choking it, and maybe gaining a bit at the drag strip without that bit of restriction.
I've always run the restricted gaskets.
Regarding carb spacers, I experienced icing with the ECZ-B intake, with a 1 inch 4 hole aluminum spacer when the temperature got below about 40 degrees. I switched to a 3/8 composite divided spacer, which fixed that problem.
I have experienced no icing issues with the blue thunder and 1/2" divided, I think wood, it looks like wood, anyway, spacer.
I never had an issue with the carb getting too hot, and here in Atlanta, with stop and go traffic, it has plenty of opportunity to get hot.
I know it's not 2-4 specific but maybe something of value is here.
Lawrenceville, GA