Or why woudn't you learn how to set up a transmission?
If one is not into tuning (then I wonder why mess up with swapps) then you can always do an online research and find a proper tune for your said crazy car.
Besides that, engine swapped cars can work wonders if the player dares to detuned them a little bit and find a more reasonable amount of power for it or should I say, make the car less crazy.