as I will be selling mine soon I would like to say yes! but honestly can't...sports cars are synonymous with petrol, Ialian sports cars doubly so, I am not sure that that for the last 4 years of GT production alfa didn't have a decent petrol engine to put in it won't hold much sway with the wider public.
The diesel when modified IS the fastest , no doubt, mine, Damien's and |Tunde's are all testament to this. I have driven several 3.2's and a whole host of 3.0 GTV's and my GT is faster, the dervs are also the only GT's to have the cloverleaf badge from the factory even though the 3.2 may be more beffitting of it, but in ''classic circles'' originality is the key and in this respect the derv will fall foul of the rules too as anything that hasn't been breathed on will be a rather pedestrian drive with a 0-60 time of over 9 seconds..and a rather agricultural sounding lump up front.
I just don't quite know the diesel will ''fit'' into any category other than the looks, and even then I think the JTS, as lame a duck as it is will be chosen over a 1.9 as a first ''other viable choice'' in a GT when all the 3.2's are either owned or finacially out of reach. Its worth noting that speed isn't a pre-requisite to a car becoming a classic, but petrol almost always is.
they will rise in value a little as those on the modding scene look for something that is tunable and not one of the usual suspects but eventually they will end up as spare parts to keep the 3.2's and even JTS's on the road.
sad but I suspect true.
from a practicality and performance point of view the diesel is the best ebgine choice in the GT, but as a Classic ?..naah, don't see it.
I would love to be wrong though