From a link of the web on the Sauber Mercedes C11, http://www.ultimatecarpage.com/frame.mv?file=car.mv&num=562


General specifications
Country of origin Switzerland
Years of production 1990 - 1991
Numbers built 6
Body design N/A
Weight 905 kg / 1995.2 lbs

Drivetrain
Engine M119 90º V8
Engine location Mid, longitudinally mounted
Displacement 4.973 liter / 303.5 cu in
Valvetrain 4 valves/cylinder, DOHC
Fuel feed Bosch Motronic Fuel injection
Aspiration Twin KKK turbos
Gearbox N/A
Drive Rear wheel drive

Performance figures
Power 730 bhp / 544.6 kW @ 7000 rpm
BHP/Liter 146.8
Torque N/A
Power to weight ratio 0.81 bhp/kg
Top Speed 248.5 mph / 400.0 km/h
0-60 mph Acceleration N/A

C11 Review 1.
C11 Review 2.
C11 Review 3
"Peter Sauber was the immediate beneficiary of years of priceless Mercedes-Benz fuel management research. The 5.0-liter M119 32-valve V8s made power and torque in massive quantities while sipping gasoline."
...."Especially after qualifying – Sauber-Mercedes gridded one-two after a qualifying battle that was likely equal to the marquee value and tension of a whole F1, Indy Car or NASCAR weekend. Jean-Louis Schlesser, the man who hates Le Mans, won the pole at 155.235mph. Just barely out of the mythic 3:14s where only Hans Stuck had trodden. This lap included a staggering 248mph pass down Mulsanne in a car that had never been in a rolling floor wind tunnel."
...."The C9s were all about engines; the 5.0-liter turbo V8 was the heart and soul of the car. The C9s lacked the poise and driving comfort of the mature (old?) Porsches but were so powerful that they overcame any obstacle with on-demand brute force. (Original equipment on many Mercedes-Benz models since '37.)"
...."Sauber-Mercedes crushed all competition in the '89 Sport-Prototype championship. The Group C fuel consumption rules had become a joke before the technical might of Mercedes-Benz."

One final link that may have gold in it, Race Tech Magazine, Issue 19 list;
ENGINE PROFILE
Mercedes M119/AMG Le Mans V8
Nissan VRH35Z Le Mans V8
Toyota GT-One Le Mans V8

Sorry for the historical dump, possibly this info could be of some value for a Giant Killer Build-up?