Well since you added the DRs, LS6 intake, and cut-out that "should" put you into the 12.2-3 range with a good tune. Getting a good low 1.7 high 1.6 60 is key though. Here's a little advice......I was stuck in the low 12s forever. I always took out the jack and spare. In my quest for 11s I removed the floor mats, passenger and rear seats, rear cargo divider, and slapped on a set of weld draglites. Trust me when I say this. When I put on the welds(skinnies and rears) I dropped .2 and gained 2 mph so that's something you honestly should think about. I know you said your getting the skinnies next time out. I also had the BMR k-member and upper/lower a-arms slapped on and it got me down to 12.088 @ 115. With you being a 6 speed you should definitely be able to hit 11s with your mods and a little weight reduction. You don't neccessarliy have to get the bmr front suspension to do it either. It does drop 37 pounds off the car though
Do you have a 10 bolt still?
My opinion get tuned for the LS6 intake and cut-out, take out the passenger/rear seats/jack/spare, and borrow or buy a set of welds(just skinnies if that's all you can get). My prediction with a good launch = 11.9x
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1999 MBM T/A - the new ride

2004 CE Corvette - 1.410 - 10.246 @ 133.39
2003 Silverado - Lifted 6 on 35s
2000 T/A WS6 - 11.190 @ 119.79...SOLD