I upgraded the brakes to Weinmann centerpulls, and they're currently maxed out on the reach. So, this particular brake should work with 700c.

I already built up the 700c wheel with the S-A hub, so I'm not thrilled with the idea of giving up and buying the 590 rim to build the wheel up again.

I know Broadway Bike used to upgrade English 3-speeds with 700c wheels, but I think they also replaced the fenders. So, I'll probably have to go ask them.