Engine Sputters

Matt,
Thank you for your answer, I checked the fuel pump and it was running 8 psi, and the float on the carberator didnt seem to be sticking. The next day after I posted this question me and my dad took it out and drove it some, and it seemed to snap out of it, for the most part. It sputters a little now since it has snowed. I was wondering if the choke would cause that. Do you know which wire on the alternator to hook up an electric choke to? My old carb was an autolite 2 barrell with a hot air choke and was junk, so before we even started this motor I bought a motorcraft 2 barrell off of a ford 400 big block(it is supposedly rebuilt), which had a plug in for electric choke. I asked a local mechanic and he said to splice into a black and white colored wire on the alternator. I did, and when it was just cold outside it started up and ran perfect, but now when it is cold and snowy out the motor chugs a little bit and sputters untill it is warmed up. The choke only opens about half way, is that normal? It is a big improvement over the old carb and choke, but I was wondering if there is any way I could make it better.
Thanks for your help!
Aaron