Originally Posted by well biked
One other thing, if you go to 700c rims you'll probably need to cold set your frame so that it has rear dropout spacing to match a modern road hub (130mm). That's also going to mean a lot of changes to your drivetrain. That is, unless you can find a 700c wheelset with a hub to match the existing spacing on your frame. Or you could always build your own wheels, or have them built, using a hub to match your frame's dropout spacing and whatever 700c rims you choose. Problems, problems.....
It isn't that hard to find older 700c wheelsets all ready for 120mm or 126mm spacing. Even if that isn't desireable, all one needs to do is change the axle.
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