If this is a drag car that you want to drive on the street, then you have a couple of options. If you want big street brakes like the Wilwoods, then you have to run a 17" front rim, or run a giant 1" spacer to get the 15" wheels out past the calipers. Obviously drilling the front bearing plates for 3" studs is part of that equation. A 15" front wheel will have much better stability at the end of the track compared to a 17" wheel. Basically, if your front tires are tight, and your rear tires are loose, the front and the back of the car get into a pissing match fight. This can cause the master caution colon discharge light to come on pretty bright at the 1000' marker. If you are really serious about having fatties and pizza cutters, you have to step up to the Aerospace Components Street brake kit, like I did. I mean step up....not in price, but in sweat equity. The Aerospace brakes are a god damn **** to install. It requires grinding the knucles, drilling new holes, deleting the dust shields, making new mount points for the brakes lines, and then finding out that the bearings you just spend a bunch of time drilling for 3" studs are too worn out to work with Aerospace fixed calipers. Not that any brake modification is easy.
If your stock rear brakes aren't keeping up with the fronts, you can always upgrade to Cobra rear brakes, which is basically just a larger rotor, and an adapter plate to space out the caliper.
Kurt