Running like crap when it's cold outside
Does your intake still have a heat cross over? Not thinking I blocked mine off with the high end felpro gaskets and when I drive the car into october on a -5 morning it idles poorly and can't take the fuel until warmed up.
Mine starts fine but you need to baby sit it for 5 minutes or so as I don't have a choke.
THIS
plus--if you do have a heat crossover, it might be plugged with carbon, and if you run headers or have removed the exhaust butterfly, you may not get enough heat to the carb base.
There ARE other alternatives. Fords used to use, and you used to be able to buy (Check with Clifford AKA six cylinder stuff) used to make a plate under the carb through which you run you heater hoses
AND is the car heating up to temp? You have a 190 stat? Does the heater work properly.
The temps you mentioned ARE NOT all that cold--0C is only 32F in "our" speak. I used to run one of my cars WITHOUT A CHOKE that cold, and it WAS a little messy to start up, and you did have to warm it up say, 3-4 minutes.
Also, you might have to resort to the "stocker" air cleaner with snorkle and "heat stove" from the exhaust, that will help wintertime fun.
These guys are right. Modern aluminum 360* design manifolds, with the entire carb opening mostly a big hole, does nothing for heat transfer to the carb.
Oh, yea, if you have any think insulator spacers under the carb, remove them.
A description of what you are running would be helpful