Forgot to add this. Beyond fit, I'd look for damage to the frame I would,kt be too alarmed if you tee a tiny bit of rust, but a large amount would be of concern.

I'd also check the components. The bike originally came with Campy Mirage and a Sugino (I think) crank, plus Mavis Aksium wheels. I've swapped out most of the components on my bike, but Campy Mirage works just fine.