I would go with the 2.0L duratec but don't use the cossie intake mani because that will hurt your torque and that will not allow you to be as fast as you can be. I am removing my 2.3L duratec and installing a 2.0L duratec with our on F2 head. We will have figures and cost after Dec 18. I expect great numbers and awesome performance numbers.....
And ofcourse the 2.0L and 2.3L duratec engines are interchangeable