I would go with the 3.73 as long as your tranny holds up, after a few races my over drive started slipping but it had 93,000 miles on it.The gears really made a performance differance.Real easy to smoke the tires. I changed to a c4 now the gears are to low for the highway about 3000rpm at 65-70mph. 
		
	
		
		
		
		
		
		
			
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				My90gt
			 
		
		
		
		
		
		
	
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