I am curious as to what makes you think it was rigged for racing. I know that my old 5.2 raced alot and I haven't seen anything that defines it as a racer.
I love my 5.2 and it is a great two person boat...not sure about 3 people on it but I guess it goes okay. My favorite way to sail the boat is solo. The boat really comes alive with only one guy on it, hulls lift earlier, and the boat accelerates insanely fast when you are alone on it. The grand plan for mine is to fit it with the spinnaker I have been talking about and to start sailing it uni-rigged with just the main and spinnaker. I sail it pretty often under just the main and it is alot of fun, the boat points like crazy with just he main.