So lets compare...you ran a 12.7 at 111mph with the following mods:

355 LT1 built by Tysons Machine (I have all the reciepts, close to $5000 including the headers)

Mahle Forged Pistons 11.5:1
Scat Forged Rods
Stock Crank turned
Melling 10554 Oil Pump (Std vol)
Stock Heads
CC503 cam (224/230)
Comp 918 Beehive Springs
Comp locks, retainers, etc.
Comp Pro Mag 1.6 Rockers

Exhaust:
Pacesetter Emissions Legal Longtubes
Pacesetter Y-Pipe
No Cat (I have a 3" Catco Cat I will give you with the car if you want it)
Hooker Catback

Transmission:
Ram Clutch (1 step above stock)
Pro 5.0 shifter
Black Z28 shift ball
Harlan Shift Light

While my car has half the cylinders of your car with a hell of alot less displacement and engine work(let me remind you intake/exhaust/header is not engine work at all). I manage to pull a 14.0 at 101mph, so you ran 1.3sec faster than mine time and 10mph more with a BUILT engine.. WOW