Road racing on a closed track? Or open road racing like silver state? The speed of the car will help determine the steering ratio wich may also determine the box. I wanted to use the smaller 670 box, but the 800 had more room to play with the internals and to make a slower turning ratio for higher speeds.
I went through Mark at Savitske classic and custom. He sells both boxes and can help you with all your suspension needs as well.
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