which mastercylinder and brakebooster

On 66 Barracuda since it weighs so little do you think it needs power brakes? Many others are happy with manual disc. If want manual disc the master most rec. is 72 Charger in 7/8 bore. If mp brakes not good, do you want to replace just the master or complete setup? If 4 bolt master 72 Charger is good setup with power brakes.