slant runs crappy when cold...

FlatheadGeo said
I have the same exact problem on my 63 Valiant /6. Went so far as to buy new carb, change the plugs, points, condenser, new distributor and wires and new timing chain, new fuel pump and filter. Still does the same thing! Usually in the colder weather. On the open highway when it is warmed up, it goes like a 'bat out of hell!' Can't figure it out.
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Could also be fuel supply. I think there are 6 formulations now depending on the season. The gas sitting in the carb will have the more volatile fractions boil off from the engine heat. In cold weather those are exactly what you need to keep things moving until manifold heat kicks in.