This is a Factory Carb'd + Disty EJ engine Running in an Honduran Subaru Legacy:
(More info, part numbers and photos on this Thread ~► Here)
The 1981 Ford Escort distributor fits with little modification. Slight modification of the drive plate to mate with the cam
and open up the mounting bolt slots, in case you want to adapt a Ford Escort distributor, the parts needed from the Ford, are
the complete distributor, the plug from distributor to the ignition module, the ignition module itself, an average ignition coil and its coil wire.
As far as I know, besides the Ford Escort distributor, also the ones from the Early Mitsubishi Lancer and Ford Laser / Mazda 323 works.
By the way, regarding this statement...
...Here I found one for sale, online:
~► https://articulo.mercadolibre.com.uy/MLU-605372654-distribuidor-subaru-legacy-18-_JM
Kind Regards.