I have used a couple of lower-end 1970s Motobecanes and a 1980 Peugeot UO-9 (10?) as donor bikes, as well as a ca. 1990 Fuji with a tiny frame. I bought the Fuji for $10, salvaged the Sugino crankset and Cyclone II derailleurs for myself, and donated what I couldn't use to a local bike shop, which reciprocated with a $20 credit.
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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