Radiator hoses and dipstick location are no factors to determine the engine size.
In Europe, all top hoses are the same, only dependent on whether you have a manifold with the screw-in thermostat or not, therefore only 2 hoses, irrespective of engine size.
I have now had three 2 litre Giulias. All have dipsticks on the inlet side of the engine.
Water pumps also are not determined by engine size, rather whether or not the car has dynamo or alternator, has cable driven tachometer, (2 or 3 outlet),or is carburettor or injection.
Most Euro cars that are carburettored initially have mech fuel pumps, although lots of people change them to electric.
Your engine number looks correct, and as you say, was fitted to 2 litre GTV, Berlina & Spiders.
Pretty sure that I've seen pics of a 2 litre head with (confusingly) a 1.6 cast into it, maybe at some time the 2 litre castings were in short supply, and the 1.6's were machined to 2 litre spec ?
Seen it before in tractor manufacture.
1963 Giulia Ti Super Rep