Well...I drove the Lingenfelter equipped car this weekend. Feels strong, but seat of the pants I think the LT4 will pull it. Still it was a heckuva buy for my friend- seems to be pretty tight although it's been modified extensively and has a ton of miles on the body.
And I ordered some new shoes for the back of mine today. Mickey Thompson Street Comps 315/35/17s. Good price and good reviews. Happened to notice the back skins on mine are a little slicker than I thought..