F-Body Police brakes on an A-body
If you have a 1973 or newer A body car with disc brakes then there is no point in changing over to FMJ brakes. Same basic stuff. The only brake package that would be worth changing to would be the 11.75 inch rotors from a 1976 or newer B body car.
There isn't really a "police" brake package for Mopar cars. The police got the same brakes that Grandma got.