Just look at the drop out. If it says campy you're good to go with the RD; if it says huret, you will have issues.
I would not drill out the frame for those brakes as they are not a good choice, IMO, for the application. I'm also skeptical that those short reach brakes will hit the rim properly. The bike was built around 27 inch, not 700c, wheels and it came stock with weinman centerpulls likely the 610s which have a reach from 50 to 65 mm. If you want a quality dual pivot brake that is nutted, tektro makes them. The thing to keep in mind is that you will have to piece together different parts to make this work. Also the center pulls that came stock on this bike are fine brakes just use quality pads (kool stop).