Any motor can benefit from some turbo timing but off course boosting a 6.5 is going to be too much to handle unless you got a 2km straight
Let's say you choose a motor with a higher turn than usual (8.5 instead of 7.5 for a 2wd for exemple) then add some turbo, you will have good torque and you choice of full power speed, more flexible.
On my 10.5, I could find a setting as powerful as a 7.5 but easier to manage on low speed sections.