Camber plays a role when using Yokomo drift tires. Camber determines how much rubber contacts the ground. Ideally, you want to have the same amount of grip at all 4 wheels. That is a good starting point anyway. Once you start fine-tuning your car, you may find that having your rear camber different from the front camber is beneficial. For example, if your car understeers (and loosening your front diff would make it too loose), giving your rear wheels less camber might fix the situation. To make these adjustments, you need to adjust your turnbuckles.
Yokomo Single Ring between -1.5 and -3 degrees.
Yokomo Double Ring between -1 and -2.5 degrees.