Hey big boy, I really loved your bike in grey, have you thought about removing the rear subframe and replacing with small tube chromoly?
Back to the original point, I would think that a good diet and small engine with a stock ignition would be great for waht you want to do. I would add a small shot of NOS just for insurance and definately run on alcohol. Lately I have been playing with the rear shock off of a stock bike with a short swing arm and have been fairly impressed. I don't think I am losing to much in the takeoff. I don't have times yet, all testing so far has been done in the driveway, but I have high hopes, since nobody pays any attention to a bike with shocks.lol