Hi, Geoff,
Yes, Witt's is the late type engine.
You can tell from the very boxy (rectangular) shape at the back of the manifold and the centre port for the vacuum pipe for the brake servo. The CSV is of a smaller diameter ( and different design) and uses a paper gasket instead of the 'O' on the earlier valve.
The throttle control rod (that runs across the engine ) is also shorter by about 40mm and I guess also the breather pipe, water pipe to the WRD and fuel line to the CSV. The rubber 'glove' that goes on these two pipes is also shorter.
I thought that the later bayonet type oil filler caps came in with these late engines, but Witt's picture would suggest not!
Is your car RHD?
Note the gap between brake servo and manifold in the second pic.
Naj