Series 1 covers a wide range of changes to Landrovers. They all had flat sides, and the petrol ones had IOE engines, either 1.6 or 2.0l, with 2.0l diesel in 1957 an option. All had pedals through the floor, and all had headlights in the radiator support. The earliest were the 80" and these differ most from later ones, and also had the most production changes. Collectible, and some parts hard to find. These were replaced by the 86" and the 107" introduced. With very little change these went to 88 and 109". Probably the best option for Series 1. The 107" five door wagon is in many respects the most interesting, and quite rare. 
Series 2, although looking significantly different with a distinct waist and pendant pedals, is otherwise very similar to the last Series 1, except for the new 2.25 petrol engine, based on the diesel. Series 2a introduced the diesel upsized to 2.25, and marked the start of ongoing progressive change. 1967 saw a change to negative earth and cable operated wipers, key start, and other changes, and about then the six became an option. 1969 saw the headlights move to the mudguards, and the last Series 2a were in 1971. 
Series 3 is distinguished from Series 2a mainly by door hinges, windscreen hinges, a plastic grille and plastic dashboard, plus all synchro gearbox,and changes continued. 1979 saw the optional V8 and about 1981 the Isuzu diesel. Last Series 3 was 1983.
My choice is the Series 2a. Note that most mechanical and body parts are interchangeable if not identical from first Series 2 to last Series 3, although traps for the unwary include changes from BSF/Whitworth to Unified threads, to metric threads - but the changeover was still incomplete by the end of Series 3, which still has a few BSF and Whitworth and a lot of UNF.
Hope this helps.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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