3,750lbs, 450-60 at the wheels, having to shift into 4th, I would say 12.1-2 with a great driver and air. 11.9 with DRs and some luck. Plenty of lightly cammed LS3s near this weight with this RWHP running slower than this.
Driver, practice in the car, and DA are the keys. The other night at Atco there was a ZL1 struggling to get into the 12s. I have seen GT500s in a similar struggle.