Bill would beat me, my only chance is to tree him and driving skills. The launch is the key. Motor to motor, Bill wins. I would give Bill a good 3 car lengths, that'* about .75 seconds. Perhaps a bit more then that.
400 pounds can be shaved off. I got my car to within 200 pounds of the GTX. But I had no seats, other then the drivers seat, and everything that could come out was gone.