I raced with a guy from NM that has a spitfire with a 302 SB Ford with 2 turbos mounted just about where the rear tires are. He could run low 10's on just 5 to 6 lbs of boost. He had a really trick cooling system set up in his trunk. With a boost controller he could just lower it down and run in another class. He said it's in a few magazines, it was truly some custom creative work that he designed mostly himself.