I put an injected 5lt in one of my Toranas. The engine was out of a club sport 195kw. I modified the original EFI harness, at the time it looked daunting but was actually not that hard. I grabbed a Gregory's EFI book which was very simple to follow. Really there is only a few wires you have to reroute. If you're using a vr, VS or vt computer and harness you can even use a 5volt input to simulate the vats system controlled by the body control module., that will save having to get the original gm computer reprogramed.