74 imp rear disks on 72 fury?

FYI, when I was (drag) racing, I had no problems stopping with the 73 front disk brakes and 11x2.5 rear drums. This was when the car was heaviest, around 4350 lbs (with me driving). One thing I like about drum brakes is that they do not drag as much as disk brakes do (factory stuff). But Front disk with the large rotors made a huge difference over front drums (and they were 11x3 on the front).
 
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