Knebnr,
If you hit those sppeeds with stock gearing, 18/41 will not hurt your low end at all with your HP. I am running the 18/41 and have friends down in Florida that are running the 18/41 fro 9/10's runniing. I can keep up with a 1397cc stroker when I hit my bottles. Hey maybe 19/41 and Turbo? What do you think about 220mph? yhea I know they don't make a 19, but just maybe.