My car has a 2.76 gear in it now, 8 3/4. You would have to find used for that gear. I need a sure grip still. From what I understand the C bodies had 2.76 sure grips. Also thinking since my car is probably 900 lbs or so lighter than a new challenger, the 2.76 might be just right. I could step up to a 2.94 too, if it "lugs" too much. I am estimating my engine putting out around 400hp, so I am in the window of a stock 5.7 hemi. I haven't selected tires yet though I do like the "steelies" with dog dish caps. I was thinking of 275/60-15 or 295/50-15 if I stay with those rims. 275/60 is 28"D and the 295/50 is 26.6"D.
I don't know how much it was raised but I told the shop I am using a shaker hood so the engine has to be in the stock location. They assured me it is. I think they took the conservative route and just cut a lot to be sure. I wasn't planning on this as I wanted to use the stock console but that isn't going to happen now. I am fitting in the new challenger console, which solves the shifter issue I was going to have.
