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braking is typically limited by tire grip and thermal dissipation. 3 cars with identical weight, weight distribution, and tires, one with 10.87" discs, one with 11" drums, the other with 13" discs will probably stop in the same distance from say, 60 mph. but do multiple hard stops from speed, you'll get brake fade quickly with the small disc and the drum car....

my duster stops very good with 10" drums all the way around....from say, 50mph. once on the freeway, I had to make a hard stop from 75mph when an accident happened a few cars ahead of me....by 25MPH my brakes were gone from heat soak....had to swerve and go in the grass to avoid the car in front of me....

There are a lot more factors but I'm not going into it. I'm used to stopping from well above 120mph and the factory drum brakes in great shape with the proper shoes(not replacement crap) are capable,but fade will become a problem on repeated stops. With the factory tires and such I wouldn't worry so much about real braking.