Up to 150 mph at the stripe, you should be fine, about 7400 rpm. That is figuring on decent lockup of the converter. You might want to call the converter builder and ask them . I suspect though that you will be told to try it. More gear with the glide will help, so if you have faith your motor can trap as high as 7600, i would run the 4.56. what track are you going to run at? I may be in your area right now.
I'll be racing in Monterrey Nuevo León, Mexico. Elevation is 1400 but with the heat corrected altitude goes up to 5000+ in the summer. We were having and event today and tomorrow but it got canceled. We have rain int the forecast. It was going to be cold so altitude was going to be at around 1500 give or take. It would've been great to know the potential of the engine.
