Junkyard parts are fine unless they try to kill you. The gas pedal assembly we've been using in the CC/Rambler was scalped from an automatic-equipped '83 Concord wagon in a wrecking yard south of L.A.
Safety first! How many times have we all heard that? Even though it sounds like a nag, it's a good idea to practice it when it comes down to it. I know I have plenty of things I want to do in life, so ...