so my 1979 model is a B120, but did the datsun 1200 sedan, wagon,coupe end its production line in 1976? so if my ute was made 3 years later then my comercial light weight ute should be of that year? if so then the weightshould be of a 1979 sedan? so of the 120y production? but then in 1978 the datsun 1200 utes then became the b121 which had squared head lights and replaced the b120, so if i was for a engine conversion which weight can i go off? the datsun 120y sedan at 900kgs or the datsun 1200 coupe 700kgs? thanks for reading guys