In this case car and motorcycle analogies don't do it for me. When we're talking cars a 20 year old car will have a 20 year old engine, and a new car a new engine. No matter what bike you ride it's always got the same engine.

I love the way a good vintage road bike rides. You should certainly ride it ASAP. Give it some air and some lube, and a good washing, and ride it, then if you want to do any restoration, or upgrades go to town.

If you then feel you want to see what the exciting world of STI, and carbon fiber has to offer, start hanging out over in the road forum and head down to your local bike shop where they will be all to happy to indoctrinate you, but in the meantime, there is really nothing stopping you from experiencing the joys of cycling right now. That's a great bike you have. enjoy it.