got an early christmas gift this week which was a quick performance housing and axle package. was wondering which rear disc brakes some of you were using. it's a late large bearing set up,5/8 studs,35 spline. was looking at the right stuff zdcrdm1 package. seems like a good start less emergency brake stuff. any modifications needed? going in my 81 malibu with a warmed up street 350. thanks