I have been trying to convert my '71 Plymouth Satellite from manual brakes to power brakes, I have all of the parts, it's just that there are two studs above where the master cylinder was. I was wondering of the was any way of taking those out?

 

Are they in the firewall or the reinforcement plate

 

I am wondering the same. I would think that the plate would swap as well giving the proper bolt pattern for the rest of the application.
Of course the studs could be removed any number of ways, but is this the right way to go. What was there and what are all the parts to swap? Not at all sure of your particular application but some pic's might help. Kinda hard to tell, not knowing just what is intended.