1962 Dart where bodies, not A bodies
1963 and later Darts where A bodies
The 1960 to 1962 Mopar A bodies came in two different brands, Chrysler Lancers, maybe Dodge ?????? (CRS ), no Plymouth A bodies from 1960 to 1962.
the Hyper pack slant six with the four barrel and four speeds started in 1960 or 1961,the 273 LA motors where introduced in mid year 1964 with the single exhaust and two barrel carbs only for the rest oft hat year I what I remember I think they added the four barrel, bigger cam and higher compression ratio in the beginning of 1965 on the 273 in both brands of the A body , not late 1964