That is what I would do. The adapter immediately above the manifold says that the original carburettor was a Zenith not a Solex (changeover was about early sixties, but there is no guarantee that a vehicle this old has the original engine).
New Zeniths are available from some of the Landrover specialists - last one I took note of was Land Vehicle Spares, but I am sure they are not the only one. I think they are made in India, which hould have no bearing on their quality.
John

