"When you are that far off, it is the hardest thing in the world to drive," Biffle said. "This is the toughest thing I've ever done in my life, drive and try to stay in the top 20."
Brad Keselowski dominates on way to Richmond win →
He said Friday there are many "moving parts" in finishing a deal and that the parties will meet with primary sponsor 3M in Minnesota next week for additional discussions.
Biffle, Roush Fenway closing in on contract →