Well I went and tryed the 787b on dream car champ cape ring
set it to 590pp (still breaking in, ended race at 591pp)
I used
Priano's 787b tune as a base and tweaked it.
The adjustments allow a 2:24 lap time after opening lap. which will give you an easy win so more can be taken out of the car still.
591pp win gives 3.78mill and 374k exp (browser rebooted lost the exact numbers)
Aero 50/70
Ballast 179 kg
Ballast pos 34
Engine 50%
Final Drive 4.235
Spring rate rear 12.5
ARBs front 4
Toe -0.08/0.08
If it's not listed here than it's the same as Prianos tune. Which is a great solid tune very very fast I think the 787b is my new dream car seasonal event car