Ratings were up for CBS’ National Football Conference championship game Sunday between the San Francisco 49ers and the Dallas Cowboys, according to A.C. Nielsen overnight statistics.CBS’ NFC championship Dallas-San Francisco contest finished with a 32.8 rating, 55 share, up from a 28.8/51 overnight rating a year ago. (Last year’s number came up about 2% nationally.) CBS’ pregame show was also up in the ratings and a 15-minute postgame show did a 29.2/45, up from a 25.8 a year ago, helping boost “60 Minutes” to a 27.8/ 41. Not all of “60 Minutes” ratings can be attributed to football, however, since the show has been on a roll the past few weeks. The Eye network easily won prime time Sunday in the overnights but fell behind ABC in the movie battle with “The Switch” vs. the first half of the miniseries “Telling Secrets.” NBC, which had the earlier of the two playoff contests and had to battle news of bombs dropping on Iraq, tackled a 24.9/50 with the Buffalo-Miami AFC championship, off 7% from last year’s 26.9/55. The web, which will broadcast the Super Bowl on Jan. 31, did generate higher numbers for its pregame telecast compared to last year despite declines in its game and postgame programs.