I had a ProFlex myself years and years ago. It was a 754 and I bought It new because the Bikestore told me it was a great bike. I believed him... Only half a year later and some heavy use made me clear that this bikes were not strong enough for the heavier ones.
Shouldn't there be a Girvin in this bike? Mine had a normal Girvin (don't know the type anymore) but most of them had the one with the "noleen" forks (parallel system?).
Good luck, look nice!