I have a 1994 engine but I need a computer and the harness from the computer to the engine. Several salvage yards suggest going with a 1992 computer. They said I would only have to change the intake & throttle body. Is this true? I would prefer the 92 computer since it is easier to tweek. Would I have to change the intake manifold or just the plenum? Will my injectors and rails work? I am a novice at this so help is appreciated!