Cold Weather - bogs down shifting into second

Wasn't sure if this was the right forum to post this in, but hopefully you guys can help with this, as you have in the past.

My '79 3 speed auto 350 L-48 just recently had a new carb (Edelbrock) put on it. In the warm months I had absolutely no problems with it, but now it's getting cold (lower to mid 40's). Since I've been starting it in the cold weather I have noticed that when I first start out she has a tendency to bog down when she shifts into second gear. It's almost a hesitation at the gear change, then like she's getting no gas with a sudden surge that makes her sputter and sound just awful!

After she warms up she's fine, and shifts normally. Is this something to do with a cold weather mix that isn't adjusted correctly? Or do I just have to let her warm up longer before I take her out on the road? Should I take her back to the guy that installed the carb and have him re-adjust her for the cold? But then will I have to have her re-adjusted again when warm weather hits?

Thanks again guys and gals,

The cold air is giving you a denser air charge, thus giving you a leaner mixture. I would guess that you need to fatten up your secondaries or make them dump slower. (I'm not sure how to do that on an Edelbrock.)