As has been said by the Administrator, it is a Post War engine, the water jacket looks fairly good but the picture does not give enough definition, if you are going to remove the head studs be very careful as they can be weakened at the junction of the head & block due to corrosion of the steel stud , effectively making a notch where they often shear!
Unfortunately the studs become tight due to them corroding down the stud drilling!
As you have a 16/80 it should have a Cats Paw block. Unfortunately these are very difficult to find & often very corroded!