Congrats on the 7.9's. I am still trying to get mine to do it. My best so far has been 8.08 @ 90mph with a 1.94 60' on just street tires w/ the mods in my sig.
Put some tires on that thing and let it eat! It makes a big difference. If you dont have a diff brace, you need to get one to many hard launches and you will rip the rear diff cover into.