First, how many miles are on the motor? 

To go EFI, the best is a complete parts truck.  Will need fuel tank, and all the EVAP stuff.  The wiring, ECM, intake, AFM, sensors, and everything else to make it work.  OR you can get the factory carb rebuilt, cam and header will help open up the motor.  And if your not into crawling, an older Weber carb will help give you more power for sure.  But they are not fans of rock crawling.  I say older Webers, because there is reports of the newer carbs are garbage.