i have a 99 2500 suv i am selling the 5.7 motor and tranny. i want to put a diesel motor in it. what do i need for the swap? do i have to change the computer and gas tank? only a 6.5 and 6.2 will fit? will a 84 gmc 6.2 diesel engine fit and is that a good engine? i am doing the swap for fun and to save gas. anything will help. thanks