If you simply want to replace tubular rims with clincher rims, most traditional 700C rims can be cross-laced onto the same spokes, assuming the spokes and nipples are in good condition. This is what I did with the used wheel set I bought for the Bianchi. It now has Campagnolo Gran Sport hubs and Campagnolo Omega clincher rims.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069