I also have that exact bike. I fell in love with the looks and bought it online...it was my FIRST purchase of a "vintage" bike, and I'm pretty sure I overpaid. But I don't care, it was (and is) one of my favorite bikes to look at. Mine was all original and, for me, uncomfortable. At the time, I didn't know anything about fit...so I changed things trying to make it work for me. Nothing worked until I changed it into my commuter/townie bike. And now I love riding it to work.
I can tell you that the panto'd pieces are hard to find and fairly valuable...so hold on to them if you're going to change anything.