Do i do this FF trade?

Although Gore is a great pickup, I'd say no. I'm not sold on Porter doing much at WR and to lose what most people consider the #1 WR is a major hit. I'm sure Chicago is going to have a good defense, but I don't think they will be THAT far ahead of other good defenses like PHI. Lastly, you never know what kind of numbers McGahee will post with his new team. He will certainly get the opportunities and I believe he's got the skills. He should be a fine #2 RB to Jackson for your season.