"Special" Intake Manifold?

[Synchro909]

Originally Posted by Benson

Looks like a RHD intake where someone cut the stud off the manifold then drilled and tapped hole to install vacuum line.

Normally that is the place where the bell crank for the linkage for spark advance is found on RHD cars

From the rough casting it was likely made in Argentina.

I agree with that. The post for the bell crank has been cut off and drilled for the vacuum fitting.
Every model A around here has those manifolds except the foreign ones imported from the US.