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					Originally Posted by  Bob Carriere
					 
				 
				TB      Tonawanda engine plant in the USA out side of Buffulo, New York 
 
R for right hand drive   A for  military. 
 
Comments welcome if above is not correct. 
 
During the early years of productions engines were imported from USA to supplement the production facilities from Windsor, Ontario Canada. 
 
Looks very much like the original factory engine for the truck. 
			
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 I think it makes vehicle quite special.