I have two 67 Duetto's. US versions. The one that I know has the original engine (as least as far as I know back to about the later 70's has a Bosch distributor. The one that I puchased several years ago and apparently has a newer engine, had Marelli Motoplex. I put my old Bosch distributor in it after I spent many months trying to get it to start again after it died and wouldn't start again no matter what I tried. When I changed the distributor, it started right up.
(2) 1967 Duettos (currently being made into one decent driver)
1995 Nero & Tan 164Q as a second daily driver (at least in the summer) and 164LS repair project
99 Ford Taurus SHO (my daily driver, especially in the winter)
07 Jeep Grand Cherokee (Wife's DD and to haul the boat).