For street driving you should probably put a stiffer bar in there than 0.880. That is a very soft spring by today's standard. It really depends on what front tire you have and how you are going to drive the car. If you want to drive it like a real car then I'd use a bar in the 1 inch range and combine it with a high quality shock such as Koni or Bilstein. If it is just something that cruises over to the burger stand on the weekend then what you have will be fine.