Dorian, this bracket race scenario you bring up is very real, and I agree, would probably result in the turbo slant six being a poor choice for a bracket racer.
1. Don't build a turbocharged slant six car with the idea of Bracket racing it; it's just not going to be very good at that... You can have tons of fun doing other things with it (embarrassing a lot of V8's in grudge races, for example,) and taking it to car shows where the mere fact that most spectators have never seen anything like it, will generate a lot of interest.
2. If you want to Bracket race, build a naturally-aspirated, lightweight car with a huge displacement engine and a two-speed automatic with an eye toward good weight distribution and some huge (WIDE) slicks.
