By the book you're supposed to put the bias on the front if mixing.
On account of the bias breaking traction sooner IIRC.
However, in reality that is a nightmare handling situation, as the bias will wander and track pavement irregularities.
If you know anything about performance driving and skid control, bias on the rear actually creates a rear steering opportunity via a controlled skid.
Radial tires hold grip evenly until a sudden break occurs. At that point recovery is questionable at best.
Bias ply slowly lose grip and can be brought into and out of grip by feel of steering and or accelerator.
I ran radials on the front of my Super Bee and 12" bias on the rear.
"Go cart" best describes the handling of that car. The front went where you aimed it, and the rear could come around (or not) at will. Holding the wheel part way through a turn and slowly relaxing my grip while adding enough throttle to let the rear end finish the turn made drivers of LOTS of "handling" cars very envious.
The un-savy motorist could have their rear end come around unexpectedly- is the reason for the book specifying bias on the front.