FWIW, I agree with the other recommendations to forget the Campy side-pulls and put the Weinmann center-pulls back on.
My '72 P15-9 was originally equipped with 27" wheels and Weinmann center-pulls (610 front, 750 rear), and when I switched to 700C the Weinmanns' reach were just fine. There's no way standard reach Campy side-pulls would have worked.
BTW, what's the model name/year of a Schwinn C19?
__________________
- Stan
my bikes
Science doesn't care what you believe.