Yep,pulley alignment is critical, ask me how I know. The first go around on the Camaro I swapped the six for a junk yard 350. I went thru 2 napa water pumps, pulling the entire pressed in piece thru the front both times. The NAPA dude was super cool and returned them. When I went back in for the replacement after the second one failed he pulled me to the side and told me to check the pulley alignment. I fixed the alignment and the pump lasted about 8 years until the entire motor was jerked and the new and improved car was built.
Darren
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