yes get the larger bracket for the larger rotors
seemed I got a set off a dippy police car with the cop rims also
the last ones I got where 88 gran fury police car and got the 360 headed 318 4-v to boot,it was a slider cam with a roller block
the large rotors and 11"x 2.5 brakes,large bore wheel cyl on the back with the adapter for a large bore 79 truck 2 bolt alum mc worked killer on my 68 A-body manual brake car
I also cut some aluminized exast tube,1.5"-2" tube with an angle to make air scoops and cut a hole in the dust sheild below the ball joint,then welded them on,tucked up there and in the air stream for max cooling
worked great for cooling the front rotors while auto-xing