440 RB engine, new transmission,new bolt pattern...

My opinion- original 4-piston Kelsey Hayes brakes should be adequate for normal street use. If you start pushing the potential of that motor, I would upgrade the brake system (more brake). Which leads us to the wheels. There is certainly a greater selection of tire/wheel combos available in BBP. You might be going to 15". With bigger brakes you most certainly be going 15" and BBP.