I would try to stick with 87-90 range, I've been reading lots of posts that 88 and ealier stangs are getting hard to get parts for. 
 
If you buy a stock fox, you will have the satisfaction of creating your ride!  There are many easy bolt-on mods you can do to enhance performance exhaust, underdrive pullies, K&N filter, removing the air silencer. 
		
	
		
		
		
		
		
		
		
		
		
	
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