It means you have an unused manual brake / clutch pivot bushing. Since the car had a brake booster you will need another person to help install bolts in the holes that were used by the booster studs. Otherwise identical to a non power / manual application. You will need brake pedal, clutch pedal and shaft.
In '67 you can convert to front discs so easy. You use the existing spindles and the '67 discs were 4 piston calipers. No need to change the booster just the master cylinder.
However, I already have the Lincoln style Trans-Am spindle and brake kit that would have been used same years on the Mustang
I’m building a DGS Group 2 vintage road race car
Looks like I just need the pedals. I know the Mustang pedals are the same and NDP has them but I would really like to source originals and not use China parts!