Drilling the brake drums

My 66 Cuda has an "A" body 8 3/4 rear. I drilled a set of axles for the BBP and drilled my drums. I can run a 3.91 gear and tall(er) tires (15 inch BBP wheels) for the 1/4 mile, then just change the axles to the small bolt pattern and use a short 13 inch wheel/tire for the 1/8 mile. Don't have to touch the brakes, at all, since the drums are reinstalled as they came off. A lot easier then swapping chunks. If redrilling the axles, I don't recommend press in studs (not a lot of metal in the flange) use half inch threaded studs.