The sources I have from South America ( not Central America ) , in particular Venezuela, Peru, Ecuador and Brazil, mention Datsun 1500's with J14's and J15's engines. Sedans, ( 2 and 4 doors ) and station wagons all have leaf springs on back . The first cars having the L series engines are the Datsun 160J's and the Nissan Stanza ( called the 510 in the US, the 1980 on 510 ). The Datsun 1600 p/u truck ( the 620 in the US ) came with the L16 engine too.
I am not surprised at the diversity of engine / vehicle combos, I have seen that in other Datsun models ( B210s in the US came with A series engines, while overseas there was the PB210/Sunny excellent 1400 which came fitted with an L14 , and the 140Z/160Z which were PB210s in sport trim and with the L14/L16 engines respectively, all dual carbureted w S/U's ).... but I am surprised at the lack of disclosure, there is nothing written , at least in the english written media, that explains the fact that Datsun 510 cars also came fitted with "J" series engines and leaf spring suspensions. Interesting.