What are you trying to accomplish?
Put an early 4.0 into a 95' or later truck? Or add OBD-II management system to a ECC-IV 4.0?
If it's the first, just strip down the engine and place all the later stuff on it. (intake manifolds, fuel rail, Injectors, CPS, EGR, etc). Throw it in.
If it's the later.......you're in for a treat.
Btw, ECC-IV is a pretty good management system. ECC-V just adds more complication=more problems=more headaches=more $$$.