Actually, I kept the stock spring rate and made some little changes for the rest:
Suspension
Ride height: 65/65
Spring rate: STOCK
Dampers (Comp): 6/8
Dampers (Ext): 8/7
Anti-roll bars: 3/4
Camber: 0,0/0,0
Toe: -0,15/0,15
Brakes: 6/7
LSD
Initial torque: 11
Accelerartion sensitivity: 14
Brake sensitivity: 6
Power
Buy the High RPM Turbo and use the power limiter to 88,9% (with changed oil)
Transmission
Just put the top speed to 390 km/h (400 km/h if you believe it's reaching the "red' RPMs too early)
I didn't put ballast on the car. Your 2J must be 821 kg when you buy it.
Notes/Tips: The car is a little unstable when you exit the corners. Try to avoid understeer at the Lesmos and Ascari chicane by changing from 1st to 2nd gear quickly. To get a good entry at the Parabolica use handbraking before turning (don't overdo it!), keep a middle line and change to 2nd gear at 170-180 km/h.
There you go! Good luck
👍