Could be a Harrell or Gibb Chevrolet 427 conversion. The old COPO Connection list of Gibb Chevy II's list 3 of the Grecian Green cars with a notation of Harrell involvement. A fourth went to Branine, who sold several Harrell 1968 Camaro and Chevelle conversion cars. Do you have the name of the original owner? The list indicates 28 of the cars with the original owner's names. 
 
I recently spoke with one of the former Gibb employees who indicated he thought around half a dozen of the Chevy II COPO's were converted to 427 at the dealership. The original engines were kept for warranty replacements.  
 
I wouldn't throw away the 427 emblems. Any metal badges on the left front corner of the hood or console, or traces of filled holes indicating where they were originally rivetted when sold new? Ray Morrisons COPO has red 427 emblems, the black emblems may also have been used? 
 
Attached is a picture of Ray's Dick Harrell 427 conversion COPO.
		 
		
		
		
			
		
		
		
		
		
		
		
		
	
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