318 t/b swap onto 360 carbed

my uncle has a 90 ish model van with a 318 he is giving me for a little of nothing and i have thought about trying to swap my dart over to the TBI setup on the van how feasable is this swap? Im aware of what the fuel system will require, Wondering about what kind of wiring mess it will be, Im looking to gain fuel milage and wouldnt mind a small power loss as this is my daily driver and cruising car. Any input appreciated