I have pursued several variations on this theme. I freely change gear ratios, and even number of gears, to something which suits my needs (a total range of mid 40s to mid 90s gear-inches, preferably with 6-7% development). I have put SunTour rear derailleurs and Shimano or SunTour front derailleurs on every Peugeot I have owned, and I have a nice set of dual-pivot Shimano brakes ready for my Bianchi, because I just don't feel safe with the early Campagnolo sidepulls. I am having the most fun with the pair of Capos, updating the upgrading the components on the 1959 and keeping the 1960 very nearly stock, although I will probably rebuild the wheels with stainless steel spokes and clincher rims. However, I am keeping the original Campag. Gran Sport derailleurs, Agrati cottered steel cranks and steel road quill pedals, and the adjustable-reach Ambrosio stem.
__________________
"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