Re: distributor code?
			 
			 
			
		
		
		
			
			These were assembled in multiple batches and some way in advance of the anticipated engine/vehicles they were intended for.Your date of 1966,July,28th day seems typical to me for a 1967 model year vehicle which began production in Aug./Sept.1966. 
With that date,it most likely would've been used in a 1967: 
*427/385HP Passenger 
*396/375HP Camaro 
*396/375HP & 350HP Chevelle 
..and for any above assembled in Canada too.  
I would just wipe it down gently for now as it can always be restored later. 
Let the new buyer restore it if they want/need to,so they'll have that satisfaction of knowing how & who did it. 
		 
		
		
		
		
		
		
		
		
	
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