How fast are Grand Nationals?

I raced a Regal T type on the street last fall and had him by a few cars. He said the engine was stock but was using alcohol injection, and running 20 pounds of boost. He had a drag suspension and a built tranny. We went off of his count, and let me say he had me off the line, and I had drag radials. He said it usually runs 13.3's at the track. Now he installed a huge intercooler off of a truck and some other parts and I heard he wants a rematch this summer. Since then I've added a 150hp shot that should get the job done.