I have a complete Vedette engine & yes a single water pump .The Vedette motors I've seen have a single water pump. Weren't the Vedette-style flatheads produced up to 1990?
In fact the Vedette was originally designed in Detroit as a new US Ford for '48 or '49, but as the economy turned out to be much better than feared after WW2, demand for a larger car was anticipated & the smaller Ford design was given to Ford France. A new larger sized Ford was drewn for the US market & the Mercury kept its shape as originally intended.Did anyone notice that the front fenders on the Vedette look a lot like the fenders on the '49 and '50 Mercurys?
Rog