UPDATED: Here's video of him...
As far as QBs go, Former Kentucky QB Jared Lorenzen was a big guy when he played for the Wildcats and New York Giants. Well, if that was big, this is enormous. Lorenzen is currently weighing in at 320 and playing for the Northern Kentucky River Monsters of the CIFL. Check it out... Image Link Image Link
You can see a video of him scrambling and making a play here