I've never had any luck with under drive pulleys with the car having the stock alternator or water pump.  I had cooling and charging problems. 
 
Right now I've got a MARCH underdrive crank pulley, the alt pulley with a 130amp alt, and a Cobra overdrive water pump pullley (drives the pump faster).  I'm very happy with this set up. 
 
 
With you mods, I would start saving for a 2600-2800 stall converter for your car.  That would make a huge difference. 
 
 
 
-Josh, aka the tireburner 
		
	
		
		
		
		
		
		
			
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				1987 Buick T-type 
 
1998 HD Electra Elide
			 
		
		
		
		
		
		
	
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