That wasn't the question. Those are two perfectly good engines, overpowered for most drivers. They are of the same family of engines and have many of the same strengths and weaknesses. The 430 has more power, a little more maintenance cost and a little less gas mileage. I don't think you really need us - it's not a big deal either way. If it was me I'd just go on the condition of the car. If equal and you can't personally justify the additional expenditure there's no reason to make it.