assuming they used a carbed engine for the transplant, but when I did my 95 v6 swapped in a carbed 68 302 I pulled every thing electronic out. It all depends on how they did the swap. If they left the fuel pump in the tank and just put a low pressure regulator on it, or if they went to a mechanical pump on the engine. If they used the electronic pump in the tank you need the pcm to turn on the pump unless its wired direct to the ignition. Basically with a carbed engine key on = 12v to the coil and dizzy , giving spark and the rest is compression and fuel . The only thing that didn't work on my 95 was the tach in the dash cluster, but I used aftermarket any ways.