Disc Brake swap-A body Rotors
I totally agree with avoiding the wheel spacers, not that safe, especially if you decide to race your car.
Doctor Diff is a great guy and will set you up. He is a longtime member on the Moparts website and is basically the Mopar head for rear setups including brakes.
Give him a shout and he can fill you in on all the details, re: axle swap.