0-60 = ((weight in kilograms) / (bhp * .9))
This works out in my case to about 4.19. I would say my estimate was close if not perfect.
Sorry about the jab.....and I sure don't want to flame you......but I just don't believe it.
With slicks, you have a mid 12 sec car...a far cry from the Vette'* mid 11'* without slicks.
By that formula the Vette, at 3140 lbs and 505 hp compared to your 3800 lbs and 423 hp doesn't add up, RWD or not.
Sure your (2nd gear dyno'd) torque number at 527 ft-lb is higher than the Vette'* 470 ft-lb rating and I sure would like to believe your 0-60 time is similar but I just can't believe it.
My guess at your 0-60 would be closer to 4.7 sec.
That'* still dam quick for a Bonne and you should be very proud.