You need a new everything. K-frame for starters. New gearbox or change the bell housing as the ecotecs have a different mating arrangement than the 5L. New gearbox X-member as the 5L are obviously longer. New dash setup change the tacometer, and new wiring harness. Removal of the thermo fan i'm pretty sure the 5L are visco fans. And a new radiator as the cooling inlet and outs are different.