Do I need different control arms?

Well i can tell you this, i have a 67 barracuda fastback with the same front disc brake set up..and the problem you will have is that the control arms will not be the same. These specific brakes on the 67-69 barracuda year range were what i like to call "special". These were the only years that are universal for the control arms and their application. If the plungers are seized and are no longer usable you are looking at paying about 13 dollars per cylinder, that times 8 cylinders can be pricy. If i were you i would really look for a mopar B Body brake set-up, it will eliminate a lot of hassle, trust me. If you really want to spend a little money on these brakes contact P-S-T (performance suspension technology) they will set you in the right path. Good luck on the project, its always MOPAR or NO CAR!!