That's a pretty dang sweet bike Miyata 610--- what rims/hubs/tires are you running?

You've upgraded with really changing the basic sport-touring nature of the bike-- that's something missing from many upgrades I've seen. It's really impossible to make a race bike or a tricked out loaded touring bike out of the 80's light-touring bikes. Your bike is one of the good all-arounders that defined the 80's. Now we have really good specialized bikes-- carbon frame racers and super study dedicated touring bikes. Miyata made mid level bikes students and weekend warrors road around in Converse tennis shoes. Most cyclists today take themselves way to seriously.

What's still stock on the bike besides the crankset? Have you had to change out the headset (it was Tange stock I believe)?