Hire a Rigger
I had the same problem with a 89 Cat 30, had the mast down this winter and did not know where to start. Instead of lost sleep, I hired a professional Rigger. Might have been the best $100 I ever spent. He replaced all of the clevis pins, cotter pins and tuned the rig. He also went over the rigging pointing out some minor issues I need to keep an eye on. I watched him very closly, and could do the job myself next time; this said I would still bring him back just for the piece of mind. Just for the record I tend to do most projects on the boat myself. This past spring I completly re-built my steering system, replaced my rudder, installed new wind, speed and depth and the list goes on. My point, I enjoy doing my own work, but the rigging is too important to leave to chance. This guy did not even use a guage, it was like he was tuning a piano.