yep basic uno with a lump.its a 1.7 diesel,yes i know not your fastest beast in the world but you can get loads in.
Hmm,turbo fiorino ! i like the idea but need the van.looks even more attractive now i cant find a gear box.
well basicly any uno engine will fit with it's gearbox, and axels as a whole.
doesn't mather if that is an petrol or diesel version.
I dunnohow it works in the uk, but over here in the netherlands it does need an extra checkup/test when you cange the type of fuel, or even the engine for a bigger (read more BHP) version.
but asfar as your current 1.7 diesel engine, they are built to last forever, they do make alot of noise, and are slow as feck.. but they will go on for ever.