Duster Breaks FAST Small Block Record

I'm pretty happy with 12's and a car that I can drive on the street or give a modern Mustang or Challenger a run at the track. But it is hard to not fall to a 13.1 so a few speed secrets without going too crazy down the $$$ path would be nice.
Like the Liion batteries in the faux case for weight. It is really worth it for 20 lbs?