Chain pull free wheel lock should be the original for a 49. The Fairey (or any other) overdrive will fit (but whether the 1.6l engine will pull it is another matter). All Series 1 engines petrol will pretty much just drop in. While the 2.25 petrol or diesel was the reason that 2" was added to the wheelbase in 1955, I understand that it is possible to shoehorn them into the earlier models, although a later bellhousing will be needed. 
What is worth considering though, is that any 80", and particularly one that early, is sufficiently historic to warrant sympathetic restoration rather than modernisation. 
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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