I can see the aesthetic appeal of these cars, but you're certainly finding obscure possibilities for a conversion!
The Alfa Romeo Type 939 was unique, with none of the other cars planned to use the same platform (underlying chassis design) having gone into production, and this design produced by Alfa for only a few years; fortunately for parts availability, the Type 939 included the much more common sedan variant - the Alfa 159 - not just the Brera and Spider
Again, it's front wheel drive. In this case, an AWD version was produced (in the Alfa 159 Q4 sedan only, not the Spider or Brera) so with Q4 parts it might be possible to put the motor in the rear, driving the rear wheels, if you're interested in that (and willing to do a lot of work).
Every car produced and sold in both North America and Europe has been required to be equipped with an onboard diagnostics (OBD) port since about 1996 to 2003 (depending on country/state and engine type), to support emission control system monitoring. Auto manufacturers were going to computer networks anyway, but this made those networks universal, and CAN is the most common type (OBD-II has been required to support CAN since 2008).
I don't know what brands and models are dependent on CAN systems in what years, or what you would give up by not working with CAN in a vehicle that uses it. Obviously emission controls don't matter in an EV conversion, but there are potential issues with braking, instrumentation, and even simply turning the headlights on. Even the accelerator pedal may be nothing but a sensor on the CAN bus.