The stock rear hubs are zero-degree toe. B44 rear hubs are the same.
There are two ways to get rear toe on SC10 arms.
Buy aluminum hubs with 1/2, 1 or 1.5 degrees of toe.
Buy losi XXXT rear hubs and hinge-pins. They come in 1-degree and 2-degree
I run the losi rear hubs with great success. Lots better rear traction, easier to keep it smooth. I also swapped to the 30-degree caster blocks and moved my battery back (split the foam into two pieces - 1/3 - 2/3) and added 1.5 ounces of lead in the rear of the battery box.