I've seen average drivers pull 13.5-13.8 sec 1/4 in a stock LS1 F-body. I haven't seen a good driver run a stock one, but I'd bet 13 flats are possible. And I have seen a WS6 with a 125 wet shot pull an 11.6 on Nittos. I believe the Vortech adds about 150hp to stock...is that right Gman?
At the altitude I raced it at (3800 feet here in Calgary), the best stock run I ever saw an SS or WS6 pull was in the high 13's. The average is well into the mid 14's.
My car, which sorry Lazs, I didn't list all the mods on, had an all time best of 12.4 here in town, and ran a 11.85 in the next Province east of me at an elavation of about 50 feet asl.
I have seen Mustang 4.6's with Supercharger/stage 3 NOS kit and other work done run in the 9's, and not just one or two, like 50 or 60 here in Calgary and at Race wars in Edmonton.
Most of the Chev 350 cu. SS's and RamAir's with superchargers and stage 1 or 2 kits will run in the high 11's and low 12's consistently, depending on tires, driver, and everything else done to the car.
I'm admittedly not the best or smartest racer out there, but I easily have the best reaction times out of the hole when I raced in my category. (I dunno why, but I attribute some of that to my other hobbies, being Pro-Paintball (retried now) and action pistol shooting, both of which requrie very fast reflexes). If I had the inclination, which I don't now, I'd pursue racing further, but now I pretty much just watch and talk about it with other people on message boards. I had a pile of fast cars in my day, from Rx7 R1's to Stealth Turbos, an early model Viper and my RamAir's and SS's. Now I own a house (gee thanks wife), and take the bus :/ .
I really do like funked's car though, something about those little ricers with AWD that have always done it for me I guess.
I DO have some videos of my last GM car running in some heats, I'll upload em to my ftp and post them later tomorrow.