I have owned several old pushrod Campag. Gran Sport front derailleurs and the far more familiar and more recent swing-arm Records. The Gran Sport is great for half-step gearing (your 54-51 or my 49-45 on Capo #2), but the Record is better suited to the 8- or 9-tooth 1.5-step gears on my other bikes (47-38 on Capo #1, 50-42 on the Bianchi). Unfortunately, the first owner of Capo #1 had worn out the front derailleur's aluminum case, evidently by failing to keep the unit properly oiled.