Short answer is yes. I am going to find a pair of 73+ A-Body spindles with 4 inch piston brake calipers to get the car back on the ground on tires. So when I bought the kit from AJE, I purchased with that in mind.
Long Term is I want to run some form of MOPAR multi piston caliper system. At this time, the only setup I know is the 65 thru 72 A-Body setup. This will require a earlier knuckle/spindle, and a changed steering arm.
If anyone knows of a MOPAR bolt on multi-piston brake setup which will fit the late model A-Body knuckle, please let me know.