If I were buying a swap car, I'd be looking at the suspension, brakes, rear axle, transmission, and gauge cluster, to ensure the V8 parts were installed versus the 4 cylinder parts, and I would want a factory SEFI set up, not a carb. Even little things like the EGR solenoids on the back side of the passenger strut tower should be there. If the swap is done right, you should be able to compare it to a V8 car, and not be able to tell the difference. A lot of people swap the engine, and short change the rest. If they did it all this stuff right, the swap aspect would not scare me off, and to some degree would be a plus. I personally swapped my car back in 99, using my wrecked 89 as the donor car.