Disc or drum

Obviously Mopar Muscle did not optimize both systems. If they had an adjustable proportioning valve and adjusted each system until the fronts skidded just before the rears, then both drums and disks should have applied the same force to the rear wheels.

Yes, their setup stopped the car shorter on dry pavement, but did they try it on wet pavement, maybe while turning? The rear wheels might lock up before the front wheels, making the car less safe to drive than with rear drums. The front/rear balance issue is one reason why I decided to stick with factory equipment when I switched from drum to disk brakes. (My '74 got the '73-'76 large bolt pattern brakes; on a '68 I might have gone with a pre-1973 factory disk setup.)