I'd love to try this and have thought of it before but I agree it would only be of interest as an engineering challenge since a 1300 upgrade or a 1600 swap would be far easier and more rewarding!
Great to see it seems at least feasible though - I spent last winter removing, refurbishing and refitting a 2000HF engine/gearbox/subframe and engine ancilliaries so I have some recent knowledge of whats what under the bonnet. In the picture below I can see the fuel injection "brain" sitting disconnected on the drivers side wheelarch and a power steering reservoir on the front passenger side!
...it has had an SU Carb, probably because the original would sit too high...
The carb seems to be fitted where the fuel injection throttle body goes on the rear of the inlet manifold but it still has the 2000HF fuel injection rail (part of) and fuel injectors fitted too - and these seem to be connected to the fuel supply line! And I can see other FI bits and bobs underneath the fuel supply line too. Maybe the carb was planned as a crude air meter or is that an electric fuel pump sitting up near the battery?
I wonder if it has ever run?
Based on the above, I doubt it! Though its likely someone made an optimistic attempt! Hard to see any non-standard (and likely side-draught?) carb working well with the long intake manifold design of the 2000HF which is mostly air column not fuel/air while on the other hand, the Bosch FI system needs all its electronic components to be present for it to work and this includes a throttle position sensor and various other sensors.
Interesting, how does the bonnet lock now
as the hood rail, bonnet catch and safety catch have been done away with as far as I can tell from the very limited photos, pity there aren't more detailed photos of the engine and it's fitment.
This picture below can be enlarged and you can see there is a pair of connected bonnet release catches (again from a 2000) fitted behind each headlamp but probably no safety catch.
http://s886.photobucket.com/albums/ac63/nedetailing/Lancia%20fulvia/?action=view¤t=P1050244.jpgThe clearances around the engine must be very tight and it would be interesting to see how it was done - the Flavia/Fulvia subframes and their mounting points to the body are similar at the front and upper points but different at the back and so are the engine/gearbox mountings - though the gearboxes are the same (with different bellhousings).
I was going to say a Fulvia subframe was used but then I noticed the non-standard wedge on the floor under the clutch and brake pedals and something similar on the passenger side floor- that is where the Flavia/2000 rear subframe mounts are located (and where Fessia apparently intended them for Fulvias too instead of in the mud and water trap behind the wheels). So I guess some inboard mounting points were put on to take the 2000 subframe. I can't see if the usual Fulvia chassis outriggers are missing too.
Bumper is a bit forward? And perhaps the lower front valance too? Even in a 2000 there's NO room ahead of the engine and rad!
Real curate's egg - I wouldn't expect it to make over a grand and I wouldn't give more than 500 for it and I'm a fan!