used these over here. the britih army has sold them off as scrap and had to buy them back again for use in Northern ireland i know a guy who has one and run to the shop in it for fun.
i have a austin champ to restore myself, think all these had the same type of engin with Interchangeable parts i know that my champs distributer cap has 8 plugs although it only uses 4.
got the complete Reme workshop manual on CD for my champ from a guy in Aus.