I put a Veloce 50/34 on my 69 Comp, but I needed a long cage RD, so went with the matching Veloce RD also. Six speed SIS Shimano freewheel. 8 speed chain. Some old campy FD. Works like a charm. In hindsight, I probably could have got by with a med cage, but I wnated to keep the option open to go 34T in back.