What carb are you running? (mild 318)

I am running this carb on my 318. The below carb has annular boosters, which provide finer atomization than downleg or straight boosters.

https://www.summitracing.com/parts/sum-m08600vs/overview/

I am running this carburetor on a 1 Ton with a 318. Really like it. Easy starting and runs well. I do not live in a cold environment, so can't comment on the icing deal.

sb