I would say that if the car doesn't have an engine at all then it would be a great upgrade!
but seriously, the 250 was mass produced so there are alot of parts readily available for it. I like them the best but that's just me, depends what you want to do though. For highway gears the lower the number, the better mileage you will see on the freeway. I think mine are 2.73 or something in that neighborhood.