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			I have an old magazine from 1976, The Chevy Bible, it has a parts and pricelist for HiPerf parts for big and small block engines.  
		
		
		
		
		
		
			
		
		
		
		
		
	
	It list a #3947083 Manifold Asm, Open Plenum under carb. L88, ZL1. Price $173.00 They also list #3947084 As a High riser divided plenum for 396 and 427 Street engines $155.00 The list also has L88 shortblocks for $875.00 If only one had bought a bunch of those back then, good investment. Jan  | 
		
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