Since I have the car both the Monaro CV8 and Commodore SS, I gave the SS some drift sessions, and here is the result, a base tune for drift that should work :
Tuning Parts Installed
ECU
Sports Intake Manifold
Racing Air Filter
Sports Exhaust Manifold
Titanium Racing Exhaust
SuperCharger
Clutch-Twinplate
Flywheel-Semi Racing
Adjustable LSD
Carbon Drive Shaft
Full Custom SUspension
Comfort Hard Tires
No Ballast or downforce adjustments
Transmission - Default ratio-no changes as it's already great for drifting in 2nd and 3rd gear.
LSD
Initial Torque: 20
Acceleration Sensitivity: 30
Braking Sensitivity: 25
Suspension
Front, Rear
Ride Height: (-20), (-10)
Spring Rate: 9.5, 6.5
Dampers (Extension): 4, 6
Dampers (Compression): 2, 4
Anti-Roll Bars: 3, 5
Camber Angle: 3.0, 1.2
Toe Angle: -0.10, -0.3
Brakes
F/R : 3, 9 - Recommend to disable ABS, this BB is suited for braking while sideways to lower the speed quickly, while maintaining angle.
Specs
Horsepower: 477 hp at 6000 RPM
Torque: 494 lb-ft at 4500 RPM
Weight: 1658 kg
Performance Points: 518
The simple tuning is good enough for drifting, but you can always do weight reduction. I find the car as it is already has a good balance. Let me know how the car goes, cheers. Oh, I did the tuning with controller and all aids off, including no ABS.