RE: Under Drive pullys
+1 on the water pump.
BTW JP you DO NOT need a steeda pully to run the steeda timing adjuster.
IT will work with the stock pully no problem.
As far as I am concerned Electric water pump is the only way to go. screw the pullies. There was a article in hot rod magazine, where they added headers, pullies, ect to a new Mach 1. The car actually lost power with the underdrives.