Well Im looking into some options for the GFs 1990 2500 Chevy Z71. Its her baby and her project, however I have to be the brains of the drivetrain. Looking into two big options, Engine swap to a Vortec 350 with Holley throttle body OR swap to a 6.2 diesel. I like the ideal of a diesel, but only a turbo diesel. SO here it goes: option 1: Engine swap to a 6.2 diesel w/auto trans, and add a turbo. STart with a core and rebuild the diesel for more power and torque. custom plumbing a turbo w/intercooler at 6-10 PSI. option 2: emgine swap to a turbo 6.5. How difficult would this be? Looking for some UMPHH to turn 36" tires.