I am thinking about putting a vortec 4.3 in my k5. The setup would be 84k5 4' lift,64's in the rear with flip,37" x terrains,3/4 rears 4.10,rear disk,4.3, 4l60e,doubler,cage, I know when i had my 98 chevy pick up it had the 4.3 vortec in it and it ran very well. Got good milage and seemed to have lots of power. I willnot be towing anything and i dont run much mud. (anymore) I figure i will have lots of gearing for offroad and on road i will have the overdrive. The only thing may be a change to 5.13 gears. Well Whats everybody think?