That is good to know. Thanks! So what do you think, have someone braze centerpull bosses on, or just go with the bike on ones? There is a certain elegance to the brazed on ones, but if there's no real advantage, well...
The posts are much closer than on a modern bike which is why most cantis won't work right on a Trek 720. Frankly, I'd get the bike repainted and get some center pull brakes. They work great and will give you plenty of clearance.
Another possibility might be a 650b conversion but the bottom bracket might be a bit too low. Still 650bs would be sweet as you'd have plenty of room for fat tires.