it will physically fit under the car, but i think the 16v has beefier hangers, also the 16v is bigger bore so there will be a increase in diametre between your manifold and the exhaust. theres a little lee way in the tapered flexible gasket at this join, not sure if its enough.
Now, see, this is interesting. When I stuck the 2 litre lump in the Nova, the original 1.2 was exactly the same diameter, allowing me to bodge the down pipe from the Cav engine in to the front joint of the Nova.
I think I need someone to measure the o/d of their 16V exhaust for me to compare.