The six is easy to distinguish from the four.
Four - carburettor on left
         gear lever two bends,
         four spark plug leads
         mechanical fuel pump
Six - Carburetter on right
       gear lever one bend
       six spark plug leads.
       electric fuel pump
The grille and badge are not definitive - a swaptakes about thirty seconds with a scewdriver. 
You should be aware of the possibility of a Holden (or other) engine being fitted to what was originally a four (or six).
A picture of the engine bay would help a lot, as would an interior picture showing the firewall.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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