I don't think there's any such thing as a 1300 valencia. Valencia was 957 and 1117cc in the fiestas, with 3 bearing cranks, the 1298 and 1598 engines were kent crossflow with 5 bearing cranks, totally different engines. Later ohv 1300s were HCS engines, and different again. Certainly CVH kent cams are stamped on the end with their type, could be the same with crossflow cams? Not so easy to get to as on the CVH though! I would get the weber twinchoke which should be on the engine, be so much more reliable and economical. To use big carbs, an engine needs loads of other mods eg head, valves etc.