Wannabe is correct; consider the 350 ft-lbs to be a minimum torque. The outer ball-bearing is captured by a machined step in the carrier and a steel plate bolted to the outside. The inner bearing is unrestrained except by the pipe-like inner spacerm and the torque that holds everything in a stack. And late GT5-S cars use STRAIGHT roller bearings in the inner position with ball-bearing torques on the axle nuts. BTW, a new/stock spanner-nut can take well over 800 ft-lbs before stripping becomes an issue, and the two axles take left and right-hand threaded nuts.
If your car uses tapered roller bearings from a conversion, it depends on who did the work because there are at least two different designs. One still uses the inner spacer and ball-bearing torque on the nut. This design of conversion IMHO needs extremely careful fitting to work, as tapered rollers normally take NO pre-load at all beyond hand-tight.
